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1. 
What's a common factor of 27
A.
9
B.
10
C.
11
D.
12
2. 
What's a common factor of 15
A.
3
B.
4
C.
5
D.
6
3. 
What's the common factor between 27 and 18?
A.
7
B.
8
C.
9
D.
10
4. 
What's the common factor between 49 and 84?
A.
4
B.
5
C.
6
D.
7
5. 
What's the common factor between 330 and 25?
A.
5
B.
6
C.
7
D.
8