Divisible by 9

Divisible by 9 is discussed below:

A number is divisible by 9, if the sum is a multiple of 9 or if the sum of its digits is divisible by 9.

Consider the following numbers which are divisible by 9, using the test of divisibility by 9: 

99, 198, 171, 9990, 3411.

(i) 99

Sum of the digits of 99 = 9 + 9 = 18, which is divisible by 9.

Hence, 99 is divisible by 9.


(ii) 198

Sum of the digits of 198 = 1 + 9 + 8 = 18, which is divisible by 9.

Hence, 198 is divisible by 9.


(iii) 171

Sum of the digits of 171 = 1 + 7 + 1 = 9, which is divisible by 9.

Hence, 171 is divisible by 9.


(iv) 9990

Sum of the digits of 9990 = 9 + 9 + 9+ 0 = 27, which is divisible by 9.

Hence, 9990 is divisible by 9.


(v) 3411

Sum of the digits of 3411 = 3 + 4 + 1+ 1 = 9, which is divisible by 9.

Hence, 3411 is divisible by 9.



Consider the following numbers which are not divisible by 9, using the rules of divisibility by 9:

73, 237, 394, 1277, 1379.

(i) 73

Sum of the digits of 73 = 7 + 3 = 10, which is not divisible by 9.

Hence, 73 is not divisible by 9.


(ii) 237

Sum of the digits of 237 = 2 + 3 + 7 = 12, which is not divisible by 9.

Hence, 237 is not divisible by 9.


(iii) 394

Sum of the digits of 394 = 3 + 9 + 4 = 16, which is not divisible by 9.

Hence, 394 is not divisible by 9.


(iv) 1277

Sum of the digits of 1277 = 1 + 2 + 7 + 7 = 17, which is not divisible by 9.

Hence, 1277 is not divisible by 9.


(v) 1379

Sum of the digits of 1379 = 1 + 3 + 7 + 9 = 20, which is not divisibleby 9.

Hence, 1379 is not divisible by 9.

 Divisibility Rules.

Properties of Divisibility.

Divisible by 2.

Divisible by 3.

Divisible by 4.

Divisible by 5.

Divisible by 6.

Divisible by 7.

Divisible by 8.

Divisible by 9.

Divisible by 10.

Problems on Divisibility Rules

Worksheet on Divisibility Rules







5th Grade Math Problems 

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