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  1. Chapter 1 Class 7 Integers
  2. Serial order wise
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Example 3 Verify ( 30) [13 + ( 3)] = [( 30) 13] + [( 30) ( 3)] ( 30) [13 + ( 3)] = [( 30) 13] + [( 30) ( 3)] LHS 30 [13 + ( 3)] = 30 [13 3] = 30 10 = 300 RHS [( 30) 13] + [( 30) ( 3)] = [ 3 10 13] + (30 3) = [ 3 13 10] + [90] = ( 39 10) + 90 = 390 + 90 = (390 90) = 300 Since LHS = RHS Hence verified

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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.