View Single Post
Old 11-05-2013, 10:30 PM   #7
DogCatMom
Knitting the Flap
 
Join Date: May 2011
Location: S.F. Bay Area
Posts: 384
Thanks: 80
Thanked 140 Times in 110 Posts
The prime factorizations of the two numbers are:

72 = 2 x 2 x 2 x 3 x 3 (sorry; can't use exponents in phpbb text-based language). This can also be expressed as 8 x 9, to help visualization.

98 = 2 x 7 x 7. Alternate expression: 2 x 49.

The only common factor, then, that 72 and 98 have in common is 2. Too bad you're not looking for factors in common for 72 and 96....that would be wonderful!
DogCatMom is offline   Reply With Quote