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- Gmat Math (divisibility And Primes)

North W.

• 13

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Divisibility Rule when you see ADDITION

A multiple of N plus a multiple of N is a multiple of N

A multiple of N plus a non-multiple of N is NOT a multiple of N

A multiple of N plus a non-multiple of N is NOT a multiple of N

Factor Foundation Rule

If a is a factor of b, and b is a factor of c, then a is also a factor of c.

Example: if 2 is a factor of 10, and 10 is a factor if 60, then 2 is a factor of 60

Example: if 2 is a factor of 10, and 10 is a factor if 60, then 2 is a factor of 60

Prime Factorization

A way to express any number as a product if prime numbers

Divisible by 2 if...

Integer is even

Divisible by 3 if...

The sum of the integers digits is divisible by 3

Divisible by 4 if....

The last 2 digits are divisible by 4

Or

The integer is divisible by 2 TWICE

Or

The integer is divisible by 2 TWICE

Divisible by 5 if...

Divisible by 6 if...

Divisible by 8 if...

Divisible by 9 if...

Divisible by 10 if...

Sum of 2 Primes

List of Prime #s

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