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Addition and subtraction methods | Year 4 Mathematics PDF Download

What are addition and subtraction methods?

There are various methods for performing addition and subtraction calculations. While many are familiar with column addition and subtraction, there are also mental methods that can be used for quicker solutions.

Addition and subtraction methods | Year 4 Mathematics

Examples

Example 1: What is 5616 - 200?
Sol:
We use the same technique when subtracting.
Which digit will change?
We are subtracting 200 which is 2 hundreds so the hundreds digit will change.
6 - 2 = 4
so
6 hundreds - 2 hundreds = 4 hundreds
Therefore:
5616 - 200 = 5416

Example 2: What is 700 - 1?
Sol: 
We could use the column method here but that would mean lots of exchanging of 100s, 10s and 1s and lots of crossing out.
It is quicker and just as accurate to just count backwards from 700
700 - 1 = 699
We call this method being efficient which means getting an accurate answer quicker and with less work.

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