Algebra Factoring Practice Test Results

Question 1
80% answer correctly
What`s the greatest common factor of 8 and 28?
4
8
1
2
Question 2
75% answer correctly
What`s the least common multiple (LCM) of 3 and 5?
30
15
3 and 5 have no common multiples
16
Question 3
65% answer correctly
Which of the following is not a composite number?
92
19
22
21