Header Multiplication and division facts for the 10

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
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Y2_Maths_Textbook.indb 31
31
• (pages 58–59): Using
+ and – to multiply and
divide by 10
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Year 2 Multiplication and division 35