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Example 4 Find the sum of (– 9) + (+ 4) + (– 6) + (+ 3) (−9) + (+4) + (−6) + (+ 3) = − 9 + 4 − 6 + 3 = − 9 − 6 + (4 + 3) = − 9 − 6 + 7 Taking − common from −9 & −6 = − (9 + 6) + 7 = − 15 + 7 Taking − common = − (15 − 7) = − 8 Rules + & − becomes + + & + becomes + − & − becomes − Rough We group positive integers together and negative integers together

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.