Preview: Solve Addition Problems Using a Number Line
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Introduction
In this activity, we will be finding the missing number in an addition.
Example
What must I add to 24 to make 29?
24 + ? = 29
Place your finger on 29 and bounce it back, to the left, one number at a time, until you reach 25. How many bounces did you do? It was 5 bounces, so we know that 29 − 24 = 5
We could also count forwards, instead of back, if we wanted. Pop your finger on 24 and bounce it to the right, one number at a time, until you reach 29. How many bounces did you do? It was 5 again.
So, 24 + 5 = 29
There is often more than one way to solve a problem in maths. Why not try both methods and see which one works best for you?
In this activity, we will be finding the missing number in an addition.
Example
What must I add to 24 to make 29?
24 + ? = 29
Place your finger on 29 and bounce it back, to the left, one number at a time, until you reach 25. How many bounces did you do? It was 5 bounces, so we know that 29 − 24 = 5
We could also count forwards, instead of back, if we wanted. Pop your finger on 24 and bounce it to the right, one number at a time, until you reach 29. How many bounces did you do? It was 5 again.
So, 24 + 5 = 29
There is often more than one way to solve a problem in maths. Why not try both methods and see which one works best for you?
Question
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Teacher explanation