This activity is about subtracting numbers.
Example
How many pounds did he have left?
Answer
We can use the number line below:
We start at 71 and go back 42 to get to 29.
When you go back 42, you can go back 1 (to get to 70), then 10, then 10, then 10, then 10, then the final 1
71 - 42 = 29
Ali has 29 pounds left.
There are many ways of doing a subtraction, but we're going to practise this method in the questions that follow.
View the activity introduction for more information on the topic
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Question
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Teacher explanation