How many distinct prime numbers are the factors of 70?

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

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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how many distinct prime numbers are the factors of 70?

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.