1 82, 2 42, 3 28, 4 21, 6 14, 7 12. that's the answer :
http://wiki.answers.com/Q/What_is_the_factor_of_84

The factors of 84 are: 1,2,3,4,6,7,12,14,21, 28,42,and 84. Do the ChaCha!
http://www.chacha.com/question/whatarethefactor...

The GCF is 21.
http://wiki.answers.com/Q/What_is_the_greatest_com...

One way to approach this is to look at the difference between 70 and 84, which is 14. The greatest common factor of two numbers cannot be larger than the difference between the two
http://wiki.answers.com/Q/What_is_the_greatest_com...
