This task is about using a number line to solve addition and subtraction problems.
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For the questions below show how to solve the equations on the number line. Read through the example in the box before you start.
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Example: Sarah had to solve this problem: 96 –  = 64.She knew that 96 – 30 = 66, and that 66 – 2 = 64. So she showed this on the number line and then wrote the answer in the box:  96 –  = 64 |
Use the number lines below to show how to solve the equations.
a) 128 + = 519 
b) 345 + = 603
c) 530 – = 327
d) 906 – = 625