Question 1 - Tests of Divisibility - Playing with Numbers

Last updated at Dec. 16, 2024 by

Ex 16.2, 1 - If 21y5 is a multiple of 9, what is the value of y?

Ex 16.2, 1 - Chapter 16 Class 8 Playing with Numbers - Part 2

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Question 1 If 21y5 is a multiple of 9, where y is a digit, what is the value of y? We know that, A Number is divisible by 9, if sum of digits is divisible by 9 21y5 Sum of digits = 2 + 1 + y + 5 = 8 + y Let us check different values of y & check if number is divisible by 9 Sum of digits = 8 + y

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo