Can recall and use multiplication and division facts for all the times tables

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facts for all the times tables

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Commissioned by The PiXL Club Ltd. July 2020

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Teacher Notes

q There is not scope within one therapy to cover all the multiplication facts to 12 x 12. However, this therapy is editable so it may be appropriate to change the

numbers or the focus of particular slides to rehearse a particular multiplication table.

q The therapy begins by explaining and modelling the relationship between

multiplication, division and fractions. It is advisable to always rehearse ‘trios’ so this key relationship is emphasised at every opportunity.

q See also the PiXL Times Table app and the Times Table DTT resources for both CPD and pupil resources and sessions.

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Linking multiplication and division

7 x 2 = 14

14 ÷ 2 = 7 half of 14 = 7

!

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Linking multiplication and division

! #

! \$

with division and fractions.

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It is important to be able to recall the multiplication facts instantly. How quick are you?

Let’s use a counting stick to help us recall multiples of 5.

5 10 15 20 25 30 35 40 45 50 55 60

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Trios

Complete the missing division and fraction facts. Can you find another fact for each box in each trio?

7 x 5 = 35 35 ÷ 7 = 5 ! " of 35 = 7 66 ÷ 5 =

?

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Use what you know about the multiples of 5 to find the missing numbers and solve the problem.

! "

are there?

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Now let’s move on to multiples of 6.

Let’s use a counting stick to help us recall the multiples of 6.

Multiples of 6

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Use what you know about the multiples of 6 to find the missing numbers and solve the problem.

! #

are there?

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Trios

Complete the missing division and fraction facts. Can you find

another fact for each box in each trio?

72 ÷ 6 = ? ?

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Choose a multiplication table you need to practise.

?

? ?

1. Write down a multiplication fact and draw an array to show the link between multiplication,

division and fractions.

2. Sketch two trios for the multiplication table.

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Using the inverse to solve problems

Knowing that division is the inverse of multiplication can help us to solve problems. Let’s look at an

example.

63

Talk to your partner.

How would you go about finding the missing numbers?

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Using the inverse to solve problems

Solving problems like these involves being systematic.

Start by filling in the cells where you have both numbers for a row and a

column. For example: 4 x 6.

63

This makes 24, so I can fill in this cell. We can also solve 6 x 7 as we know both of the factors.

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Using the inverse to solve problems

Now, it becomes trickier as, for the remaining numbers, we have a factor and the multiple, but not two factors as before. The key is finding out the

missing column and row headings. This means we need to use the

inverse.

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We will write an equation to help us. I will write down what I know.

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6 x ? = 54 So, 54 ÷ 6 = ?

So, the missing column heading must be 9, as I know that 9 x 6 = 54.

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Using the inverse to solve problems

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Explain how you would use 12 x 6 = 72 to work out 17 x 6.

Start by focusing on what is the same and what is different about the two equations. I have written them out one above the other

and labelled one, ‘A’ and the other, ‘B’. This helps me when explaining ideas.

B. 17 x 6 = ?

They are both multiplying by 6 but statement ‘B’ has 5 more lots of 6 than

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B. 17 x 6 = ?

I know that 5 x 6 = 30, so the product of statement ‘B’ will be 30 more than the

product of statement ‘A’.

So, 17 x 6 = 102

Now we have worked this out, we need to explain to actually answer the

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17 x 6 = 72 + 30 = 102

Notice that we haven’t used many words. The mathematical facts help

us to explain concisely.

Conjunctions like ‘so’ or ‘therefore’ are very

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to work out 18 x 8.

Try to follow the steps and explain concisely

using mathematical statements.

Remember to use

conjunctions to support

your reasoning, e.g. so, therefore, consequently.

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the spaces?

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The dimensions of a kitchen tile are 15cm wide and 8cm high. What is the area of one tile?

Explain how you calculated this.

The height of the area to be tiled is 640cm. How many tiles high will the area be if the tiles

are fitted this way around?

15cm

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References

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