Divisibility Rules
by Auric 5A
Hi,
I want to share the divisibility rule of 7 .
Divisibility Rule by ‘7’:
Double the last digits of the given number and subtract this from the number. If it is ‘0’ or divisible by 7, then the given number is divisible by 7. Continue the rule till you reach a small number where you can decide if the number is divisible.
Example:343
Last digit is 3
Double of 3=6
34-6=28 and 28 is divisible by 7
Hence 343 is divisible by 7.
Isn’t it easy?