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Mathematics
6th -
8thgrade
Number Theory (GCF/LCM/Prime-Composite/Factorization)
18 questions
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- 1. Multiple Choice
A ______ number has only two factors; one and itself.
prime
composite
- 2. Multiple Choice
Select all numbers that are prime.
13
27
31
5
44
- 3. Multiple Choice
A ________ number has more than two factors.
prime
composite
- 4. Multiple Choice
Select all numbers that are composite.
33
15
7
19
51
- 5. Multiple Choice
{1,2,3,4,6,8,12,24} are all ______ of 24.
multiples
factors
- 6. Multiple Choice
Select a factor pair for 72.
4 and 24
6 and 13
2 and 38
4 and 18
- 7. Multiple Choice
Select all of the factor pairs listed for 60.
2 and 30
4 and 15
5 and 14
7 and 8
5 and 12
- 8. Multiple Choice
What is the greatest common factor (GCF) of 12 and 16?
48
4
3
24
- 9. Multiple Choice
What is the greatest common factor (GCF) of 28 and 56?
7
2
56
28
- 10. Multiple Choice
8,16,24,32,40,48,... are all ______ of 8.
multiples
factors
- 11. Multiple Choice
Select any multiples of 12.
12
108
44
56
84
- 12. Multiple Choice
What is the least common multiple (LCM) of 8 and 12
4
16
48
24
- 13. Multiple Choice
What is the least common multiple (LCM) of 15 and 20
120
90
60
5
- 14. Multiple Choice
What is the prime factorization of 28?
4 x 7
22 x 7
23 x 7
2 x 14
- 15. Multiple Choice
What is the prime factorization of 45?
9 x 5
32 x 5
33
3 x 15
- 16. Multiple Choice
What is the prime factorization of 110?
2 x 5 x 11
10 x 11
25 x 5
2 x 34
- 17. Multiple Choice
2 x 3 x 5 is the prime factorization for which whole number?
30
60
235
45
- 18. Multiple Choice
25 x 32 is the prime factorization for which whole number?
90
60
288
225
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