Eckington C of E First School – Calculation Policy Year Group New Curriculum – Statutory guidance Rec Numbers: children count reliably with numbers from 1 to 20, place them in order and say which number is one more or one less than a given number. Using quantities and objects, they add and subtract two single-digit numbers and count on or back to find the answer. They solve problems, including doubling, halving and sharing. Addition Calculation Subtraction Calculation Concrete: Concrete: Pictorial: Pictorial: Vocab: put together, add, altogether, total, take away, more than and less than, equal to, equals, double, most, count on, Bead strings can be used to illustrate addition numberline, leaves, least 8+2=10 They use numberlines and practical resources to support calculation and teachers demonstrate the use of the numberline. Bead strings - including bridging through ten by counting back 3 then counting back 2. 6–2=4 Abstract: 1 Eckington C of E First School – Calculation Policy Year 1 read, write and interpret mathematical statements involving addition (+), subtraction (-) and equals (=) signs Pupils memorise and reason with number bonds to 10 and 20 in several forms (e.g. 9 + 7 = 16; 16 - 7 = 9; 7 = 16 - 9). They should realise the effect of adding or subtracting zero. represent and use number bonds and related subtraction facts within 20 add and subtract one-digit and two-digit numbers to 20, including zero solve one-step problems that involve addition and subtraction, using concrete objects and pictorial representations, and missing number problems such as 7 = ? - 9. Vocab: put together, add, altogether, total, take away, distance between, how many more than and less than, plus, equal to, equals, double, most, count on/back, numberline, minus, find the difference Stage 1: Models and Images Stage 1: Models and Images Bead strings - including bridging through ten by counting on 2 then counting on 3. 2 Eckington C of E First School – Calculation Policy Stage 2: The Blank Number Line Steps in addition can be recorded on a number line. The steps often bridge through a multiple of 10. 8 + 7 = 15 (numicon - use subtraction covers) Missing numbers/use of = sign: 3+4=6+1 3+□=8 Bead strings - including bridging through ten by counting back 3 then counting back 2. 13-5=8 Stage 2: The Blank Number Line 15 – 7 = 8 3 Eckington C of E First School – Calculation Policy Year 2 solve problems with addition and subtraction: using concrete objects and pictorial representations, including those involving numbers, quantities and measures applying their increasing knowledge of mental and written methods recall and use addition and subtraction facts to 20 fluently, and derive and use related facts up to 100 Pupils practise addition and subtraction to 20 to become increasingly fluent in deriving facts such as using 3 + 7 = 10, 10 - 7 = 3 and 7 = 10 - 3 to calculate 30 + 70 = 100, 100 - 70 = 30 and 70 = 100 - 30. add and subtract numbers using concrete objects, pictorial representations, and mentally, including: a two-digit number and ones a two-digit number and tens two two-digit numbers adding three one-digit numbers show that addition of two numbers can be done in any order (commutative) and subtraction of one number from another cannot They check their calculations, including by adding to check subtraction and adding numbers Stage 2: The Blank Number Line Stage 2: The Blank Number Line / counting back 74 – 27 = 47 48 + 36 = 84 The steps may be recorded in a different order: or: *largest number first on no. line Stage 3: Partitioning Record steps in addition using partitioning: 76 + 46 Add on the tens 76 + 40 = 116 *start with whole number Add the units 116 + 7 = 123 Recording addition and subtraction in columns supports place value and prepares for formal written methods with larger numbers: or combined: Stage 2: The Blank Number Line / Counting Up 74 – 27 = 47 Start with the number you are subtracting (27) & count up to the number at the start (74) Remember to circle the counts. or: We counted on 3 to get to 30, how many more do we need to count on to get to 74? 4 Eckington C of E First School – Calculation Policy Year 3 in a different order to check addition (e.g. 5 + 2 + 1 = 1 + 5 + 2 = 1 + 2 + 5). This establishes commutativity and associativity of addition. recognise and use the inverse relationship between addition and subtraction and use this to check calculations and missing number problems. Pupils extend their understanding of the language of addition to include sum(+), tens, ones, partition. add and subtract numbers mentally, including: a three-digit number and ones a three-digit number and tens a three-digit number and hundreds For mental calculations with two-digit numbers, the answers could exceed 100 add and subtract numbers with up to three digits, using formal written methods of columnar Missing numbers/use of = sign: 4 × 5 = 10 □ 10 6 □ 5 = 15 + 15 Stage 3: Partitioning Subtraction can be recorded using partitioning: 74 – 27 = FIRST SUBTRACT THE TENS: 74 – 20 = 54 *start with whole number THEN SUBTRACT UNITS: 54 – 7 = 47 This requires children to subtract a single-digit number or a multiple of 10 from a two-digit number mentally. The method of recording links to counting back on the number line. Stage 3: Revisit partitioning. (As above) Stage 3: Revisit partitioning. (As above) Stage 4: Expanded Vertical Method Write the numbers in columns. Stage 4: Expanded Vertical Method and Compact Vertical Method 5 Eckington C of E First School – Calculation Policy addition and subtraction estimate the answer to a calculation and use inverse operations to check answers solve problems, including missing number problems, using number facts, place value, and more complex addition and subtraction. *ALWAYS ADD LEAST SIGNIFICANT DIGITS FIRST WHEN WORKING VERTICALLY Partitioned numbers are then written under one another. Adding the units first: 67 + 24: + 60 & 7 20 & 4 90 & 3 =93 10 Stage 5: Compact Vertical Method 47 76 123 258 87 345 366 458 824 11 11 11 *exchanging under the bottom line Partitioned numbers are then written under one another: Example: 74 − 27 70 4 20 7 60 6 14 14 70 4 20 7 40 7 7 4 27 4 7 Example: 741 − 367 700 40 1 300 60 7 600 130 11 700 40 1 300 60 7 300 70 4 6 13 11 7 41 3 67 3 74 * EXCHANGE not borrow. *adding money where only 1 exchange is required 6 Eckington C of E First School – Calculation Policy Year 4 Year 5 add and subtract numbers with up to 4 digits using the formal written methods of columnar addition and subtraction where appropriate estimate and use inverse operations to check answers to a calculation solve addition and subtraction two-step problems in contexts, deciding which operations and methods to use and why. Stage 4: Expanded Vertical Method (as above) and Compact Vertical Method add and subtract whole numbers with more than 4 digits, including using formal written methods (columnar addition and subtraction) add and subtract numbers mentally with increasingly large numbers practise mental calculations with increasingly large numbers to aid fluency (e.g. 12 462 – 2 300 = 10 162). use rounding to check answers to calculations and determine, in Stage 5: Compact Vertical Method 1432 +2157 3589 Missing operation sign questions: 6 □ 5 = 20 □ 10 8 □ 5 = 20 □ 20 8 □ 5 = 60 □ 20 Stage 4: Expanded Vertical Method and Compact Vertical Method Example: 563 − 271, adjustment from the hundreds to the tens, or partitioning the hundreds 500 60 3 200 70 1 400 160 3 200 70 1 200 90 2 400 160 500 60 3 200 70 1 200 90 2 4 16 5 63 2 71 2 92 Begin by reading aloud the number from which we are subtracting: ‘five hundred and sixty-three’. Then discuss the hundreds, tens and units components of the number, and how 500 + 60 can be partitioned into 400 + 160. The subtraction of the tens becomes ‘160 minus 70’, an application of subtraction of multiples of ten. Stage 5: Compact Vertical Method 7 Eckington C of E First School – Calculation Policy Year 6 the context of a problem, levels of accuracy solve addition and subtraction multi-step problems in contexts, deciding which operations and methods to use and why. perform mental calculations, (mixed operations & large nos). use knowledge of the order of operations to carry out calculations involving the 4 ops Explore the order of operations using brackets; for example, 2 + 1 x 3 = 5 and (2 + 1) x 3 = 9. solve addition and subtraction multi-step problems in contexts, deciding which operations and methods to use and why solve problems involving all operations use estimation to check answers to calculations and determine, in the context of a problem, levels of accuracy round answers to a specified degree of accuracy, e.g. to the nearest 10, 20, 50 etc, but not to a specified number of significant figures. 8 Eckington C of E First School – Calculation Policy Yr Group New Curriculum – Statutory guidance REC Multiplication Calculation They solve problems, including doubling, halving and sharing. Vocab: put together, add, altogether, total, take away, more than and less than, equal to, equals, double, most, count on, numberline, leaves, least 9 Eckington C of E First School – Calculation Policy Year 1 solve one-step problems involving multiplication and division, by calculating the answer using concrete objects, pictorial representations and arrays with the support of the teacher. Through grouping and sharing small quantities, pupils begin to understand: multiplication and division; doubling numbers and quantities; and finding simple fractions of objects, numbers and quantities. They make connections between arrays, number patterns, and counting in twos, fives and tens Vocab: groups of, lots of, times, array, altogether, multiply, count, repeated addition Stage 1: Models and Images 10 Eckington C of E First School – Calculation Policy Year 2 recall & use x & ÷ facts for the 2/ 5/10 multiplication tables, including recognising odd/even nos Practise to become fluent in the 2, 5 and 10 x tables& connect them to each other. Connect the 10 x table to place value, and the 5 x table to the divisions on the clock face. Begin to use & recall other x tables, including using related division facts to perform written and mental calculations. calculate mathematical statements & write them using the multiplication (×), division (÷) and equals (=) signs show that multiplication of two numbers can be done in any order and division of one number by another cannot solve problems involving x & ÷, using materials, arrays, repeated addition, mental methods, and x & ÷ facts, including probs in contexts. relate to grouping and sharing discrete and continuous quantities, and relating these to fractions and measures (e.g. 40 ÷ 2 = 20, 20 is a half of 40). Use inverse relations to develop multiplicative reasoning (e.g. 4 × 5 = 20 and 20 ÷ 5 = 4). Stage 2:Repeated addition and arrays *Jot down and record multiples. *Use 100 sq to colour multiples. Identify ‘fact families’ 3 x 5 = 5 x 3 Partitioning Children need to be secure with partitioning numbers into tens and ones Eg double 12 X 2 10 20 2 4 =24 11 Eckington C of E First School – Calculation Policy 12 Eckington C of E First School – Calculation Policy Year 3 recall and use x & ÷ for the 3, 4 and 8 multiplication tables Through doubling, they connect the 2, 4 and 8 multiplication tables. write and calculate mathematical statements for x & ÷ using the multiplication tables that they know, including for 2-digit numbers times 1-digit numbers, using mental and progressing to formal written methods Develop efficient mental methods - using commutativity (e.g. 4 × 12 × 5 = 4 × 5 × 12 = 20 × 12 = 240) and x & ÷ facts (e.g. using 3 × 2 = 6, 6 ÷ 3 = 2 and 2 = 6 ÷ 3) to derive related facts (30 × 2 = 60, 60 ÷ 3 = 20 and 20 = 60 ÷ 3). solve problems, including missing number problems, involving x & ÷ , including positive integer scaling problems and correspondence problems in which n objects are connected to m objects. decide which of the four operations to use and why, including measuring and scaling contexts, (e.g. 3 hats and 4 coats, how many different outfits?; 12 sweets shared equally between 4 children; 4 cakes shared equally between 8 children). Stage 3: Mental multiplication using partitioning. Pupils develop efficient mental methods, Also record mental multiplication using partitioning: 43 x 6 = 40 x 6 = 240 (4 x 6 = 24) 3 x 6 = 18 240 + 18 = 258 Stage 4: Introduce Grid method: 38 7 = (30 × 7) + (8 × 7) = 210 + 56 = 266 *2 digit number vertically so easier to add up columns 13 Eckington C of E First School – Calculation Policy 14 Eckington C of E First School – Calculation Policy Year 4 Recall x & ÷ facts for tables up to 12 × 12 use place value, known and derived facts to x & ÷ mentally, including: multiplying by 0 and 1; dividing by 1; multiplying together three numbers extend this to three-digit numbers to derive facts, for example 200 × 3 = 600 into 600 ÷ 3 = 200 recognise and use factor pairs and commutativity in mental calculations multiply 2/3 digit numbers by a 1-digit number using formal written layout; short multiplication solve problems involving x & +, including using the distributive law to x 2-digit numbers by 1 digit, integer scaling problems and harder correspondence problems such as n objects are connected to m objects. Write statements about the equality of expressions (e.g. use the distributive law 39 × 7 = 30 × 7 + 9 × 7 and associative law (2 × 3) × 4 = 2 × (3 × 4)). Combine their knowledge of numberfacts and rules of arithmetic to solve mental and written calculations e.g. 2 x 6 x 5 = 10 Stage 4: Grid method as above: larger number vertically so easier to add up columns Stage 5: Compact vertical method 38 7 266 5 Make sure it goes underneath Cross through when used. 15 Eckington C of E First School – Calculation Policy Year 5 x 6. solve two-step problems in contexts, choosing the appropriate operation, working with increasingly harder numbers. This should include correspondence questions such as the numbers of choices of a meal on a menu, or three cakes shared equally between 10 children. identify multiples and factors, including finding all factor pairs of a number, and common factors of two numbers solve problems involving multiplication and division where larger numbers are used by decomposing them into their factors know and use the vocabulary of prime numbers, prime factors and composite (nonprime) numbers establish whether a number up to 100 is prime and recall prime numbers up to 19 multiply numbers up to 4 digits by a 1/2 digit number using a formal written method, including long multiplication for two-digit numbers x & ÷ numbers mentally drawing upon known facts x & ÷ whole numbers and those involving decimals by TU X TU 56 × 27 is approximately 60 × 30 = 1800. HTU x TU 2 X 8 6 2 9 2 5 7 4 5 7 2 0 8 2 9 4 16 Eckington C of E First School – Calculation Policy 10, 100 and 1000 use multiplication and division as inverses to support theintroduction of ratio in year 6, for example, by multiplying and dividing by powers of 10 in scale drawings or by multiplying and dividing by powers of a 1000 in converting between units such as kilometres and metres. recognise and use square numbers and cube numbers, and the notation for squared (2) and cubed (3) solve problems involving x & ÷ including using their knowledge of factors and multiples, squares and cubes solve problems involving all 4 operations and a combination of these, including understanding the meaning of the equals sign solve problems involving x & ÷ , including scaling by simple fractions and problems involving simple rates. 17 Eckington C of E First School – Calculation Policy Year 6 multiply multi-digit numbers up to 4 digits by a two-digit whole number using the formal written method of long multiplication identify common factors, common multiples and prime numbers multiply one-digit numbers with up to two decimal places by whole numbers 18 Eckington C of E First School – Calculation Policy Yr Group New Curriculum – Statutory guidance REC They solve problems, including doubling, halving and sharing. Vocab: put together, add, altogether, total, take away, more than and less than, equal to, equals, double, most, count on, numberline, leaves, least solve one-step problems involving multiplication and division, by calculating the answer using concrete objects, pictorial representations and arrays with the support of the teacher. Through grouping and sharing small quantities, pupils begin to understand: multiplication and division; doubling numbers and quantities; and finding simple fractions of objects, numbers and quantities. They make connections between arrays, number patterns, and counting in twos, fives and tens. Yr 1 Division Calculation Sharing: ‘Is it fair?’ USE COUNTERS OF DIFFERENT COLOURS When sharing you know how many groups you will have; you are working out how many will be in each group. Don’t ‘over – teach’ sharing! Pupils should : use lots of practical apparatus, arrays and picture representations Be taught to understand the difference between grouping objects (How many groups of 2 can you make?) and sharing (Share these sweets between 2 people) 19 Eckington C of E First School – Calculation Policy 2 Key Vocabulary: share, share equally, one each, two each…, group, groups of, lots of, array How many groups of 4 can be made with 12 stars? = 3 Grouping (and use of arrays) link to REPEATED ADDITION/x tables 9 ÷3 = 3 (groups) As this relies more on times tables knowledge, it is better to use this strategy than sharing. Children should understand that even when solving a ‘sharing’ problem, they can solve it quicker through grouping. recall and use x & ÷ facts for the 2, 5 and 10 x tables, including recognising odd and even numbers Practise to become fluent in the 2, 5 and 10 x tables and connect them to each other. They connect the 10 x table to place value, and the 5 x table to the divisions on the clock face. They begin to use & recall other x tables, including using related division facts to perform written and mental calculations. calculate mathematical statements for x & ÷ within the multiplication tables and Arrays are useful to explain RELATED FACTS: 3 x 4 = 12 4 x 3 = 12 So 12 ÷ 4 = 3 And ...12 ÷ 3 = 4 Be able to count in multiples of 2s, 5s and 10s. Find half of a group of objects by sharing into 2 equal groups. Start to focus more on grouping. Key Vocabulary: share, share equally, one each, two each…, group, equal groups of, lots of, array, divide, divided by, divided into, division, grouping, number line, left, left over 20 Eckington C of E First School – Calculation Policy write them using the multiplication (×), division (÷) and equals (=) signs show that multiplication of two numbers can be done in any order (commutative) and division of one number by another cannot solve problems involving x & ÷, using materials, arrays, repeated addition, mental methods, and multiplication and division facts, including problems in contexts. relate to grouping and sharing discrete and continuous quantities, and relating these to fractions and measures (e.g. 40 ÷ 2 = 20, 20 is a half of 40). They use commutativity and inverse relations to develop multiplicative reasoning (e.g. 4 × 5 = 20 and 20 ÷ 5 = 4). 21 Eckington C of E First School – Calculation Policy Yr 3 recall & use x & ÷ facts for the 3, 4 and 8 multiplication tables Through doubling, they connect the 2, 4 and 8 multiplication tables. write and calculate mathematical statements for multiplication and division using the x tables that they know, including for 2-digit numbers times 1-digit numbers, using mental and progressing to formal written methods Develop efficient mental methods, for example, using commutativity (e.g. 4 × 12 × 5 = 4 × 5 × 12 = 20 × 12 = 240) and x & ÷ facts (e.g. using 3 × 2 = 6, 6 ÷ 3 = 2 and 2 = 6 ÷ 3) to derive related facts (30 × 2 = 60, 60 ÷ 3 = 20 and 20 = 60 ÷ 3). solve problems, including missing number problems, involving x & ÷ , including positive integer scaling problems and correspondence problems in which n objects are connected to m objects. Chunking on a number line 15 ÷ 5 = 3 Encourage children to read the question as: ‘I have 15, how many 5s?’ They can then use times tables knowledge to solve the problem, using number lines to record their thinking. Key Vocabulary: share, share equally, one each, two each…, group, equal groups of, lots of, array, divide, divided by, divided into, division, grouping, number line, left, left over, inverse, short division, ‗carry‘, remainder, multiple Finding a remainder 17 ÷ 5 = 3 r 2 Encourage children to read the question as: ‘I have 17, how many 5s?’ How many WHOLE groups of 5 can they count in 17? What’s left over? This is the remainder. Short division: Once children are secure with division as grouping and demonstrate this using number lines, arrays etc., short division for larger 2-digit numbers should be introduced. Limit numbers to NO remainders in the answer OR carried (each digit must be a multiple of the divisor). Remind children of correct place value, that 96 is equal to 90 and 6, but in short division, pose: How many 3’s in 9? = 3, and record it above the 9 tens. How many 3’s in 6? = 2, and record it above the 6 units 22 Eckington C of E First School – Calculation Policy Yr 4 decide which of the four operations to use and why, including measuring and scaling contexts, (e.g. 3 hats and 4 coats, how many different outfits?; 12 sweets shared equally between 4 children; 4 cakes shared equally between 8 children). Divide up to 3-digit numbers by a single digit (without remainders initially) Then teach how to carry the remainder to the next digit: Chunking on a number line with remainders (main method): Eg 46 ÷ 4 = 11 r2 x10 Pupils should recall x & ÷ facts for multiplication tables up to 12 × 12 use place value, known and derived facts to multiply and divide mentally, including: multiplying by 0 and 1; dividing by 1; multiplying together three numbers extend this to three-digit numbers to derive facts, for example 200 × 3 = 600 into 600 ÷ 3 = 200 recognise and use factor pairs and commutativity in mental calculations Use formal written method of short division with exact answers when dividing by a x1 +2 ___________________ 0 40 44 46 Eg 196 ÷ 6= 32 r 4 X 10 0 60 x10 120 x10 x2 180 +4 192 196 Partitioning: work out TU ÷ U mentally by partitioning TU into a multiple of the divisor plus the remaining ones, then divide each part separately. Informal recording for 84 ÷ 7 might be: Also show 12 ÷ 4 as 12 4 so that they are introduced to improper fractions will help with simplifying when they get older, e.g. 120÷15 =120 24 15 = 3 = 8 Key Vocabulary: share, share equally, one each, two each…, group, equal groups of, lots of, array, divide, divided by, divided into, division, grouping, number line, left, left over, inverse, short division, carry, remainder, multiple, divisible by, factor Using knowledge of multiples: *84 is partitioned into 70 (the highest multiple of 7 that is also a multiple of 10 and less than 84) ‘How many sevens in seventy? *plus 14 ‘How many sevens in fourteen?’ 23 Eckington C of E First School – Calculation Policy one-digit number solve probs involving x & +, including using the distributive law to x 2 digit numbers by 1 digit, integer scaling probs and harder correspondence probs such as n objects are connected to m objects. Write statements about the equality of expressions (e.g. use the distributive law 39 × 7 = 30 × 7 + 9 × 7 and associative law (2 × 3) × 4 = 2 × (3 × 4)). Combine their knowledge of number facts and rules of arithmetic to solve mental / written calculations e.g. 2 x 6 x 5 = 10 x 6. solve 2-step probs in contexts, choosing the appropriate operation, working with increasingly harder numbers - include correspondence questions such as the numbers of choices of a meal on a menu, or three cakes shared equally between 10 children. find the effect of dividing a 1/2 digit number by 10 and 100, identifying the value of the digits in the answer as units, tenths and hundredths Also could record mental division using partitioning as: 96 ÷ 7 = (70 + 26) = 10 + 3 = 13 r5 Short Division: dividing numbers with up to 3-digits by a single digit 24 Eckington C of E First School – Calculation Policy Yr 5 Divide up to 4 digits by a single digit, including those with remainders Start by revisiting: Chunking on a number line (as above) 196 ÷ 6= 32 r 4 x30 Yr 6 divide numbers up to 4 digits by a one-digit number usingthe efficient written method of short division and interpret remainders appropriately for the context divide whole numbers and those involving decimals by 10, 100 and 1000 divide numbers up to 4 digits by a two-digit whole number using the formal written method of long division, and interpret remainders as whole number remainders, fractions, or by rounding, as appropriate for the context use written division methods in cases where the answer has up to two decimal places 0 60 120 x2 180 +4 192 196 Short division with remainders: Now that pupils are introduced to examples that give rise to remainder answers, division needs to have a real life problem solving context, where pupils consider the meaning of the remainder and how to express it, ie. as a fraction, a decimal, or as a rounded number or value , depending upon the context of the problem. Key Vocabulary: share, share equally, one each, two each…, group, equal groups of, lots of, array, divide, divided by, divided into, division, grouping, number line, left, left over, inverse, short division, „carry‟, remainder, multiple, divisible by, factor, inverse, quotient, prime number, prime factors, composite number (nonprime) Short division with remainders: Pupils should continue to use this method, but with numbers to at least 4 digits, and understand how to express remainders as fractions, decimals, whole number remainders, or rounded numbers. Real life problem solving contexts need to be the starting point, where pupils have to consider the most appropriate way to express the remainder. With decimals: Use standard method 1 2 . 5 87.5 ÷ 7 = 7 8 17 .35 25
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