how many distinct prime numbers are the factors of 70?

KeepItSimpleStupid

The answer is 4. First, let's see you factor it.

Credendovidis

Just break down 70 to it's smallest numbers (as in : a x b x c = 70) where none of the numbers can be divided by another number than 1 or itself.

Than count these smallest numbers (factors).

Example : 34 = 2 x 17 --> 1 x 2 x 17 = 34 --> 3 factors

Success !

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Perito

Start by figuring out he prime numbers up to the square root of 70 (9x9=81, 8x8=64 so you don't need to go above 8.) Don't include 1 as a prime number.

Divide by the smallest, if you can. Divide the remainder by the smallest if you can; if not, try the next highest prime factor.