Question

A number is divisible by 9 . if the sum of its digit is _____ or its multiple A)3
b)6
c) 9​

Answer 1

Answer:

a) 3

hope this will help you

Answer 2

Answer:

b) 9

Step-by-step explanation:

Divisibility rule by 9: If the sum of all the digits in a number is divisible by 9, then the number is divisible by 9

In other words, if the sum of the digits of a number is 9 or its multiple then the number is divisible by 9.

How do we find the divisibility rule for 9 ?

Let's suppose we have a number abc

A number abc can be written as:

100a + 10b + c

Let's show the numbers as a sum ( we'll try to break them as multiples of 9 )

99a + a + 9b + b + c

Here 99 and 9 is divisible by 9, so, 99a and 9b are divisible by 9. So, we can remove 99a and 9b. We're left with :

a + b + c

Here, a, b and c are the digits of the number. So, for a number to be divisible by 9, sum of its digit should be 9 or its multiple.

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