1.
What is the greatest common factor of 45, 75, and 135?
A.
25
B.
15
C.
5
D.
9
Hint
2.
Find the greatest common factor of 64
ab
3
c
2
and 48
a
2
b
2
c
.
A.
16
ab
2
c
B.
16
abc
C.
8
ab
3
c
D.
8
a
2
b
2
c
2
Hint
3.
Find the GCF of 3
x
2
y
2
and 15
xy
.
A.
3
x
y
2
B.
3
x
2
y
2
C.
3
x
2
y
D.
3
xy
Hint
4.
Find the GCF of 17
r
4
s
4
and 23
r
s
4
.
A.
17
r
s
4
B.
r
s
4
C.
rs
D.
r
4
s
4
Hint
5.
Factor 7
x
+ 21.
A.
x
(7 + 21)
B.
7
x
(1 + 21)
C.
7(
x
+ 21)
D.
7(
x
+ 3)
Hint