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  1. Chapter 2 Class 7 Fractions and Decimals
  2. Serial order wise
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Example 9 Find the average of 4.2, 3.8 and 7.6.Average = (4.2 + 3.8 + 7.6)/3 = 1/3 (4.2 + 3.8 +7.6) = 1/3 (42/10 38/10 76/10) = 1/3 ((42 + 38 + 76)/10) = 1/3 ((76 + 42 + 38)/10) = 1/3 156/10 = 156/3 1/10 = 1/3 156/10 = 156/3 1/10 = 52 1/10 = 52/10 = 5.2 Average = 5.2

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.