Multiplication and division facts for Header the 10-times table Prior learning • Can solve one-step problems involving multiplication and division by using concrete objects, pictorial representations and arrays. Learn Talk maths • Look at the charts for the 10-times table and for dividing by 10 on page 30 of the textbook. Spend time discussing what numbers look like if they’re answers in the 10-times table. Use number lines, 100-squares and multiplication tables to look at the relationship between multiplication and addition, modelling written conventions for each. Activities • Use the textbook as the basis for a discussion about related facts. Choose a fact from the 10-times table as a starting point each time. It is important for children to realise that if they know one fact, then they can easily derive three others. • Although the links to 100 Maths Lessons Year 2 focus on more than one times table each time, they contain a wide range of lesson ideas and resources that can be adapted to focus on the 10-times table only if desired. Problems • The questions can easily be extended to cover the rest of the 10-times table. The links to 100 Maths Lessons Year 2 and the Year 2 Practice Book provide various resources for further practice. • Encourage the children to create their own problems focused on the 10-times table. Ensure that they are able to use multiplication or division with confidence. Multiplication and division facts for Odd and even numbers the 10-times table Learn Learn Talk maths These are the signs that are used in multiplication and division. Look carefully at this set of four number sentences. Say each number sentence. × means multiply. ÷ means divide. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Remember the word multiple. It means the answer Numbers can be put into two groups. when you multiply. Even numbers always have a ones digit of 0, 2, 4, 6 or 8. So, in the 10-times table the multiples are: multiples Odd numbers always have a onesAlldigit of 1,in3, 5, 7 or 9. the 10-times table 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120. a 0 onesindigit. Look at the number line above forhave counting 2s. 10-times table Dividing by 10 The numbers landed on are the even numbers. 1 × 10 = 10 10 ÷ 0, 10 2, = 14, 6, 8, 10, 12, 14, 16, 18, 20 Which of these numbers are in 2 × 10 = 20 20 ÷ The 10 = numbers 2 that are not in the count of 2s are the odd numbers. the 10-times table? 3 × 10 = 30 30 ÷ 1, 10 3, = 35, 7, 9, 11, 13, 15, 17, 19 15 90 25 40 4 × 10 = 40 40 ÷ 10 = 4 Look at these two sets of numbers. 5 × 10 = 50 50 ÷ 10 = 5 Look at the ones digit. Only if it 6 × 10 = 60 60 ÷ 10 = 6 is a 0 will it be in the 10-times Even Odd 7 × 10 = 70 70 ÷ 10 = 7 table. So the answer is 90 and 40. Curriculum objectives • To recall and use multiplication and division facts for the 2, 5 and 10 multiplication tables, including recognising odd and even numbers. 8 × 10 = 80 • To calculate mathematical statements for multiplication and division within the multiplication tables and write them using the multiplication (×), division (÷) and equals (=) signs. 90 ÷ 10 = 9 100 ÷ 10 = 10 11 × 10 = 110 110 ÷ 10 = 11 12 × 10 = 120 120 ÷ 10 = 12 24 21 It is important to learn your tables so that you can remember these multiplication facts easily. 26 28 50 ÷ 10 = 5 50 ÷ 5 = 10 100 Maths Lessons Year 2 links: • Spring 2, Week 3 (pages 143–148): use 10-times table facts to solve problems Now say the first number sentence below. Use the numbers to complete the others in the set. 9 × 10 = 90 10 × ? = 90 90 ÷ ? = 9 90 ÷ ? = 10 • Summer 1, Week 3 (pages 184–189): use times table facts to solve problems involving multiplication and division Remember, if you know a multiplication sentence you can use those numbers to make another multiplication and two division sentences. Activities 25 • Oral and mental starter 25 (page 85): recalling times tables facts Copy and complete these times tables fact. 27 29 1. 6 × 10 2. 3 × 10 4. 50 ÷ 10 4. 90 ÷ 10 3. 10 × 10 • Oral and mental starter 35 (page 127): practising times tables facts Problems ✓ Tip 0 5 10 15 20 25 30 35 40 When checking if a number is even or odd, always ignore the tens Counting back from 40 in tensIthelps todigit find that 40 ÷will 10 tell = 4.you if the number is even or odd. digit. is theyou ones 30 Multiplication and division 34 Y2_Maths_Textbook.indb 30 34 Year 2 Multiplication and division 20 9 × 10 = 90 10 × 10 = 100 23 5 × 10 = 50 All these number sentences are made from the multiplication fact 10 × 5 = 50. Always check the ones digit of a number to see if it is odd or even. So, 25 has 5 as its ones digit and is odd. 24 has 4 as its ones digit and ✓ Tip is even. If you’re not sure about a fact, try a number line like this. Success criteria • I can recall, write and use multiplication and division facts for the 10-times tables. 22 80 ÷ 10 = 8 10 × 5 = 50 Brain-teaser Jane has four packs of 10 pens. How many pens is that in total? • Oral and mental starter 58 (page 249): practising times tables facts Brain-buster Mya buys six packs of pens. Each pack has 10 pens. Mya gives two packs of pens to her sister. How many pens does Mya have now? Year 2 Practice Book links: Multiplication and division Y2_Maths_Textbook.indb 34 Multiplication and division 03/12/2015 12:46 03/12/2015 12:46 Y2_Maths_Textbook.indb 31 31 • (pages 58–59): Using + and – to multiply and divide by 10 03/12/2015 12:46 Year 2 Multiplication and division 35
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