Which choices are common factors of the numerator and denominator of the fraction below? Check all that apply.
21/28

A. 7
B. 1
C. 28
D. 4
E. 21
F. 3

Question

Which choices are common factors of the numerator and denominator of the fraction below? Check all that apply.
21/28




 		A.	7
 		B.	1
 		C.	28
 		D.	4
 		E.	21
 		F.	3

stormer15 · Answer

Any idea?

stormer15 · Answer

Start by dividing both 21 and 28 by 7 and see if you get a whole number

lilday12 · Answer

D and F

whpalmer4 · Answer

no, 3 and 4 are not common factors of the numerator (21) and denominator (28).  Is 28 divisible by 3?  Is 21 divisible by 4?
@lilday12

what number do you have to multiply 3 by to get the numerator? what number do you have to multiply 4 by to get the denominator?  Are those two numbers the same number? If so, that is a common factor.