Primes, Composites, GCF, LCM
- 1. Is the number 68 prime or composite?
A) composite
B) prime
- 2. Is the number 25 prime or composite?
A) composite
B) prime
- 3. Which of the following numbers is prime?
A) 21
B) 9
C) 49
D) 37
- 4. Which of the following numbers is composite?
A) 23
B) 17
C) 35
D) 43
- 5. What is the GCF of 6 and 14?
A) 12
B) 2
C) 14
D) 6
- 6. What is the LCM of 9 and 12?
A) 108
B) 72
C) 12
D) 36
- 7. What is the GCF of 10 and 30?
A) 5
B) 10
C) 2
D) 30
- 8. What is the LCM of 6 and 15?
A) 30
B) 90
C) 15
D) 45
- 9. Every 4 months, Mrs. Morgan cleans her refrigerator and every 6 months she cleans her oven. She just did both tasks in the same month. How long until she has to do both tasks again in the same month?
A) 24 months
B) 12 months
C) 36 months
D) 18 months
- 10. Mr. Wright wants to put 36 pea plants and 45 potato plants in his garden. If he puts the same number of plants in each row and if each row has only one type of plant, what is the greatest number of plants he can put in one row?
A) 6
B) 3
C) 9
D) 12
- 11. Mrs. Stewart is arranging cupcakes on a rectangular platter. She can put either 8 or 10 cupcakes in every row. What is the least number of cupcakes that she is trying to arrange?
A) 2
B) 40
C) 80
D) 20
- 12. What is the GCF of 9 and 11?
A) there is no GCF
B) 0
C) 99
D) 1
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