Trick 23

To know whether the given number is divisible by 11 or not, the following steps are needed.

• Step - 1 : First take a number, for example : 1551.

• Step - 2 : Now take the units place of the given number i.e " 1 ".

• Step - 3 : multiply this number 10 times i.e 1 × 10 = 10.

• Step - 4 : Now add this number to remaining number.

• Step - 5 : it means, 155 + 10 = 165.

Now repeat the same process again,

That is, 5 × 10 = 30.

=> 16 + 50 = 66.

Therefore, 66 is divisible by 11.

Therefore, 1551 is divisible by 11