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Chapter 16 Class 8 Playing with Numbers
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Ex 16.2, 2 - If 31z5 is a multiple of 9, what is the value of z?

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


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Ex 16.2, 2 If 31z5 is a multiple of 9, where z is a digit, what is the value of z? You will find that there are two answers for the last problem. Why is this so?We know that, A Number is divisible by 9, if sum of digits is divisible by 9 31z5 Sum of digits = 3 + 1 + z + 5 = 9 + z Let us check different values of z & check if number is divisible by 9 Sum of digits = 9 + z

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.