- 1. Which is not a factor of 35?
A) 35
B) 7
C) 5
D) 3
E) 1
- 2. Which is a factor of 40?
A) 6
B) 3
C) 9
D) 40
E) 12.5
- 3. What is one factor pair of 70?
A) 2x35
B) 1x700
C) 7x30
D) 2x50
E) 3+67
- 4. Which is not a factor pair of 60?
A) 30+30
B) 60x1
C) 2x30
D) 15x4
E) 1x60
- 5. What is the prime factorization of 18?
A) 2x3x3
B) 3x6
C) 2+6x3
D) 3x3x3x2
E) 1x18
- 6. What is the prime factorization of 72?
A) 2x3x16
B) 2x36
C) 1x72
D) 2x2x2x3x3
E) 3x2x3x2x3x2
- 7. A number that is less than 85 and 26 and 6 as factors. What is the number?
A) 45
B) 52
C) 78
D) 80
E) 36
- 8. 2x3x5x5 is what number?
A) 235
B) 225
C) 25x12
D) 175
E) 150
- 9. What is one correct dimesion of a rectangle that has an area of 40 square units?
A) 40 by 6
B) 2 by 20
C) 3 by 17
D) 20 by 20
E) 5 by 7
- 10. Sam blinks every 8 seconds and Martha blinks every 12 seconds. If they both blink right now, how many seconds will it be before they both blink again?
A) 48
B) 40
C) 16
D) 24
E) 32
- 11. We are making care packs for the homeless shelter. There are 64 toothbrushes and 40 toothpastes. If each care package contains the same thing, what is the greatest number of care packages we can make?
A) 40
B) 16
C) 64
D) 8
E) 4
- 12. What is the GCF of 28 and 35?
A) 35
B) 28x35
C) 28
D) 1
E) 7
- 13. What is the GCF of 75 and 225
A) 1
B) 125
C) 50
D) 75
E) 25
- 14. What is the LCM of 16 and 20
A) 80
B) 160
C) 4
D) 16
E) 120
- 15. What is the LCM of 45 and 73?
A) 3285
B) 1
C) 45
D) 90
E) 73
- 16. What is a common factor of 8, 12 and 20?
A) 2
B) none
C) 4
D) 1
E) all of the above
- 17. What is a common multiple of 12, 15 and 20?
A) 180
B) all
C) 60
D) 2400
E) none
- 18. Are the numbers 9 and 12 relatively prime?
A) this is a dumb question (this is not the answer :)
B) maybe
C) there is no way to tell
D) yes
E) no
- 19. Factor trees are a common way of finding the string of prime numbers. This statement is
A) false
B) true
C) Not able to answer
- 20. If Joe can run around the track in 48 seconds and Jane can do it in 30 seconds and they both start at the same time, when will they both be back at the starting line again?
A) in 480 seconds
B) none
C) in 240 seconds
D) in 360 seconds
E) in 90 seconds
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