Question

How many numbers are there from 100 to 200 which are not divisible by 2,5,3?

Answer 1

Dear you can use the divisibility test

By 2: If the last digit of the number is even then the number is divisible by 2

eg. 12356 the last digit is 6 it's even digit therefore it's divisible by 2

By 3: If the sum of all digits of a number is divisible by 3 then the number is divisible by 3

eg. 4563

4+5+6+3=18

18 is divisible by 3 so the number is divisible by 3

By 5: If the last digit of a number is 0 or 5 then the number is divisible by 5

eg.2370

Here the last digit is 0,so the number is divisible by 5

You can use this test with any number to check whether it is divisible by 2,3,5

Hope it may help you

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