1. basik idea is yukan divide 1 integer intu other integer
if result is exact...if leftover=0, then the bottom number is a fakter av the top number
2. tu fakter a number is: tri all possabel smaller numbers tu find all that R fakters
divide bi 2, 3, 4...up tu (top number)/2
3. prime number...no fakters (yu dont divide bi 1, start with 2)
4. prime fakters: wen yu divide, oenlee divide bi prime numbers
"gratest fakter"=biggest number in yer list av fakters
5. kommon fakters...du this tu 2 numbers & then thro awae NE number
that is NOT a fakter av both top numbers