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Class 7 maths · M.13 · Operations with fractions and decimals

Add and subtract decimals including negatives

Line up the decimal points to add or subtract. The sign rules are the same as for integers.

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See worked examples
  1. Evaluate: 6.3 − (−4.3)

    Answer: 10.6

  2. Evaluate: −5.1 − (−6.2)

    Answer: 1.1

  3. Evaluate: −7.4 − (−4.4)

    Answer: -3

Tip: Line up the decimal points to add or subtract. The sign rules are the same as for integers.

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