Let's go over some of the subtraction strategies 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 vertical algorithm , writing our total first, then the number we are subtracting below it. This strategy can also be really useful if we need to trade, or regroup .
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.
When we are subtracting, we can't write our numbers in any order, like we can for addition. We must write the total, then the number we are subtracting, or taking away.
uses mental and written strategies for addition and subtraction involving two-, three-, four and five-digit numbers