#divisibility test

Of the numbers 514, 5343, 3965, 3625 which numbers are divisible by the number 3?

·         514

 The sum of digits in the number 514 is 5 + 1 + 4 = 10,

The number 10 is not completely divisible by 3 so the number 514 is not divisible by 3.

·         5343

The sum of digits in the number 5343 is 5 + 3 + 4 + 3 = 15.

The number 15 is divisible by 3. So the number 5343 is divisible by 3.

When we divide the number 24 by 6, we get-

the quotient 4

and remainder 0.

That is, we can say that the number-

24 is completely divisible by 6.

24 is a multiple of 6.

and 6 is a factor of 24    

Why Fingers?

They say that ‘ol ten’s a nice base, But frankly friend that’s not the case! Yes you don’t have to strive To divide it by five, But seven’s div test’s a disgrace!

Towards a New Base

When numbers are factors that’s ace: Check if it divides the last place! Their products come next By a similar test, And tricks get you one plus/less base.

oh no

Five seven eleven are prime; Small two all through six waste your time; Nine’s great with threes, But halves are a tease; And twelve lacks five seven and dime!

FINE.