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Chapter 16 Class 8 Playing with Numbers
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Ex 16.2, 4 - If 31z5 is a multiple of 3, what might be values of z?

Ex 16.2, 4 - Chapter 16 Class 8 Playing with Numbers - Part 2


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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 has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.