Lesson

Can you remember how we use a number line to subtract one number from another? Give this problem a try.

Use the number line to help you find the value of 46 - 12.

Worked Solution

Idea summary

Number lines can help us visualise subtraction using jumps.

We can use place value models as well as the bridge to ten strategy to help us with subtraction. Let's see how in this video.

Use a strategy to find 36 - 7.

Worked Solution

Idea summary

Bridging to 10 can help us get to 10, so that subtracting can be much quicker.

Another way to solve subtraction is to use the compensation strategy. In this video we can see just how it works.

If 90 - 13 = 77, use a strategy to find 89 - 13.

Worked Solution

Idea summary

Compensation uses the answer of one problem, to find the answer to another problem

uses mental and written strategies for addition and subtraction involving two-, three-, four and five-digit numbers