To be a fast doer in Maths, one needs to be able to quickly determine if one number is divisible by another. This video explains with examples how one can quickly do this. The rules are easy and fun and once you know know them, Maths becomes a play.
Divisibility Rule for 2
A number is divisible by 2 if the last digit of the number is an even number or zero.
Divisibility Rule for 3
A number is divisible by 3 if the sum of digits in the number is divisible by 3.
Divisibility Rule for 4
A number is divisible by 4 if the number formed by last two digits is divisible by 4.
Divisibility rule for 5
A number is divisible by 5 if the last digit in the number is either 5 or 0.
Divisibility Rule for 6
A number is divisible by 6 if it is divisible by 2 and 3.
Divisibility Rule for 7
A number is divisible by 7 if twice the last digit substracted from the number formed by remaining digits is divisible by 7.
Divisibility Rule for 8
A number is divisible by 8 if the number formed by last three digits is divisible by 8.
Divisibility Rule for 9.
A number is divisible by 9 if the sum of digits in the number is divisible by 9.
Divisibility by 10.
A number is divisible by 10 if it ends in 0.
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