Slamming Subtraction

Most students can pretty quickly recognise that when something is being taken away from a number, you use subtraction. It is the rare, skilful mathematician who also remembers to subtract when the situation involves finding the difference between two numbers, or how much more or less one number is compared to another. Most students mistakenly add: aaaaah!

That's a fair number of phrases that all mean subtraction, but if you read closely you'll notice that many sound VERY similar:

1. Picture subtraction

2. Write worded subtraction problems

3. Reverse your doubles

4. Reverse friends of 10

5. Build back


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