Let's go over some of the we've looked at. These include:
jumping back, using a number line
bridging, or making up to 10
using the answer to one problem to find the answer to another problem, by compensating
We also looked at how to use a , writing our total first, then the number we are subtracting below it. This strategy can also be really useful if we need to .
Use the number line to help you find the value of 35 - 24.
Find the value of 854 - 6.
Find the value of 447 - 81.
uses mental and written strategies for addition and subtraction involving two-, three-, four and five-digit numbers