math
posted by Tomas .
1. What is the greatest common factor of:
2x2x5x7x7
2x5x5x7x7
a. 2x5
b. 2x5x7
c. 2x5x7x7
d. 2x2x5x5x7x7
e. 2x2x2x5x5x5x7x7x7x7
2. What is the least common multiple of:
3x3x5x5x5x7
2x3x5x5x7x7
a. 2
b. 5x5x7
c. 3x3x5x5x5x7
d. 2x3x3x5x5x5x7x7
e. 2x3x3x3x5x5x5x5x5x7x7x7
Please answer and explain
What is different between greatest common factor and least common multiple

#1
GCF must divide both numbers. So,
2x5x7x7 (c)
#2
LCM must be a multiple of both numbers. So,
2x3x3x5x5x5x7x7 (d)
(e) is also a multiple, but not the LEAST multiple 
#1
how to divide both mumbers 
2x2x5x7x7 = 2x5x7x7 x 2
2x5x5x7x7 = 2x5x7x7 x 5
There's no number which divides both 5 and 7, so we've reached the greatest factor of both values. 
I understand
so, #2
how to multiple of both numbers 
Thankyou so much mmrs sue