# Make a Number Line to Subtract — Let's Practise!

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## Make a Number Line to Subtract — Let's Practise! exercise

Would you like to apply the knowledge you’ve learnt? You can review and practice it with the tasks for the video Make a Number Line to Subtract — Let's Practise!.
• ### Can you use the number line to subtract?

Hints

Count back small amounts of the smaller number, 14. 14 can be broken up into a group of 10 and 4 ones.

Start by subtracting 10 from 40.

Solution

40 - 14 = 26

• Start by putting the larger number, 40, on the right.
• Count back small amounts of the smaller number, 14.
• 14 can be broken up into a group of 10 and 4 ones.
• 40 - 10 = 30
• 30 - 4 = 26

• ### How do we subtract 43 - 16 on a number line?

Hints

Should you start with the larger number, 43, or the smaller number, 16, on the number line?

Before you count back, what do you need to do?

Solution

Here are the steps for subtracting using a number line:

• Start by putting the larger number, 43, on the right.
• Break 16 into one group of ten and 6 ones.
• Count back 10 from 43 to get 33. 43 - 10 = 33
• Count back six ones from 33 to get 27. 33 - 6 = 27
• Therefore 43 - 16 = 27
• ### How many seeds will Mr. Squeaks have left?

Hints

Count back small amounts of the smaller number, 36.

36 can be broken up into 30, 5 and 1.

Start by subtracting 30 from 80, what do you get? Fill this in and continue subtracting.

Solution

80 - 36 = 44

• Start by putting the larger number, 80, on the right.
• Count back small amounts of the smaller number, 36.
• 36 can be broken up into 30 and 6.
• 80 - 30 = 50
• 50 - 5 = 45
• 45 - 1 = 44

• ### How many spare stickers does Mr. Squeaks have?

Hints

Count back small amounts of the smaller number, 29. 29 can be broken up into 20, 5 and 4 ones.

Start by subtracting 20 from 100. Continue subtracting small amounts.

Solution

100 - 29 = 71

• Start by putting the larger number, 100, on the right.
• Count back small amounts of the smaller number, 29.
• 29 can be broken up into 20 and 9. 9 can be further broken into 5 and four ones.
• 100 - 20 = 80
• 80 - 5 = 75
• 75 - 4 = 71

• ### Can you help Razzi subtract?

Hints

We can split 20 into two tens, so start by subtracting 10 from 26. What do you get?

Then subtract 10 again. What is the answer?

Solution

26 - 20 = 6

• Start by putting the larger number, 26, on the right.
• Count back small amounts of the smaller number, 20.
• 20 can be broken up into two groups of 10.
• 26 - 10 = 16
• 16 - 10 = 6
Therefore 26 - 20 = 6. Razzi has 6 cubes spare.

• ### How many nails does Razzi have left?

Hints

27 can be broken up into 20 and 7.

To get from 40 to 20, what do you subtract?

Continue subtracting from 20 to reach the final answer.

Solution

40 - 27 - 3 = 10

• Start by putting the larger number, 40, on the right.
• Count back small amounts of the smaller number, 27.
• 27 can be broken up into 20 and 7. 7 can be broken into 5 and 2.
• 40 - 20 = 20
• 20 - 5 = 15
• 15 - 2 = 13
• 13 - 3 = 10