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May 26, 2016
Posted by **paula** on Sunday, November 22, 2009 at 8:08pm.

thank you

- math -
**MathMate**, Sunday, November 22, 2009 at 8:13pmThe basic rule is, you need to know the divisibility tests for the first few primes, such as 2,3,5,(7,11,13).

For 392, start by dividing by 2 until the number is odd.

392

=2*196

=2*2*98

=2*2*2*49

Since you know 49=7*7, you would have no problem completing the prime factorization.