CLASS 8 MATHS · RATIONAL NUMBERS

Add and subtract integers

Same signs: add and keep the sign. Different signs: subtract the sizes and keep the sign of the bigger one.

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Worked examples

Example 1 · level 1

3 + 12 = ?

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Same signs: add 3 and 12 = 15, keep the sign.
Answer: 15.

Answer: 15

Example 2 · level 2

54 − (-20) = ?

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Subtracting (-20) is the same as adding its opposite: 54 + 20.
54 + 20 = 74.

Answer: 74

Example 3 · level 3

-223 + 174 = ?

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Different signs: 223 − 174 = 49, keep the sign of the bigger one.
Answer: -49.

Answer: -49