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  1. Chapter 16 Class 8 Playing with Numbers
  2. Serial order wise
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Ex 16.2, 4 If 31z5 is a multiple of 3, where z is a digit, what might be the values of z? We know that, A Number is divisible by 3, if sum of digits is divisible by 3 31z5 Sum of digits = 3 + 1 + z + 5 = 9 + z Let us check different values of z & check if number is divisible by 3 Sum of digits = 9 + z ∴ z can be 0, 3, 6 or 9

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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.