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Year 7 · Counting & Number

Add and subtract integers

Integers include negative numbers. A number line helps: adding moves right, subtracting moves left.

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How to do it

  1. Adding a negative is the same as subtracting.
  2. Subtracting a negative is the same as adding.
  3. Multiplying or dividing: same signs give positive, different signs give negative.

Worked example

−3 − (−5)
Two minuses make a plus: −3 + 5
2

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Watch out
−3 + 5 is 2, not −8.

Practise Add and subtract integers properly

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