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Counting in 8s

Count forwards and backwards in eights using this counting stick.

0 to 80 counting stick going up in eights.

If we know the answer to a multiplication number sentence or multiplication fact we can work out the answer to an unknown number sentence by adding or subtracting.

Use the counting stick to help work out what 6 脳 8 is.

6 脳 8 = 48

If we know 6 脳 8, how could this help us to work out 7 脳 8?

We just add another 8.

7 x 8 = 56

Did you know?

A multiplication fact is the answer to a multiplication calculation.

In 6 脳 8 = 48 the multiplication fact is 48.

Did you know?
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Example 1

How many apples are in this image?

How could you work it out without counting each apple?

8 x 5 in apples
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Example 2

11 octopuses.

There are 11 octopuses swimming near the shore. How many legs are there altogether?

We know that octopuses have 8 legs, so the equation we need to work out is 11 x 8.

We know from looking at the number stick that:

10 x 8 = 80

So to find 11 x 8 we add another 8.

11 x 8 = 88

So, there are 88 legs altogether.

11 octopuses.
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Dividing by 8

Division facts are division number sentences related to a times table.

If we know from the previous example that 6 脳 8 = 48 then a division fact related to this could be 48 梅 8 = 6

We can use known division facts to work out unknown division facts.

There are 56 sweets and we want to share them between 8 people.

56 sweets

56 梅 8 = 7

If 56 梅 8 = 7 then 56 梅 7 =?

Using the number fact 56 梅 8 = 7 we can work out that 56 梅 7 = 8

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Activity

Quiz

Use your knowledge of multiples of 8 to multiply and divide by 8 in this quiz.

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More on Multiplying and dividing

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