Division Tricks || Divisibility of a number by 7

STEP 1: Multiply the last digit by 2 in the given number.

STEP 2: Subtract output of STEP 1 from the rest of the number

STEP 3: Now if the result is divisible by 7,then the given number is divisible by 7.

Example 1: 672/7 =96

STEP 1: Multiply the last digit by 2 in the given number.i.e 2 X 2=4

STEP 2: 67 -4=63

STEP 3: Now if the result is divisible by 7,hence the given number is divisible by 7.

Example 2: 105/7 = 15

STEP 1: Multiply the last digit by 2 in the given number.i.e 5 X 2=10

STEP 2: 10-10=0

STEP 3: Now if the result is divisible by 7,hence the given number is divisible by 7.