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WorksheetsReview of LCM, Prime, and Composite
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
What is the least common multiple (LCM) of 5 and 20?
a)
4
b)
5
c)
20
d)
100
2.
What is the least common multiple (LCM) of 2 and 3?
a)
6
b)
8
c)
20
d)
10
3.
What is the least common multiple (LCM) of 4 and 10?
a)
4
b)
40
c)
15
d)
20
4.
What is the least common multiple (LCM) of 2 and 24?
a)
24
b)
2
c)
12
d)
48
5.
What is the least common multiple (LCM) of 6 and 8?
a)
6
b)
8
c)
48
d)
24
6.
What is the least common multiple (LCM) of 15 and 2?
a)
30
b)
2
c)
45
d)
152
7.
What is the least common multiple (LCM) of 12 and 2?
a)
24
b)
2
c)
12
d)
36
8.
What is the least common multiple (LCM) of 8 and 5?
a)
50
b)
40
c)
5
d)
8
9.
What is the least common multiple (LCM) of 3 and 20?
a)
60
b)
40
c)
20
d)
3
10.
What is the LCM?
a)
The LCM is the least common factor that both numbers share the least.
b)
The LCM is a multiple that both numbers share the most.
c)
The LCM is a multiple that both numbers share the least.
d)
The LCM is a factor that both numbers share the least.
11.
Morgan and her little brother receive stickers for doing their assignments at home each week. Morgan has 14 assignments due each week and her brother, Willie, has 8 assignments due. What is the lowest number of stickers each sibling will have?
a)
16
b)
56
c)
2
12.
In Science class, Mrs. Rollins told her class that the planets revolve around the Sun at different times. It takes Jupiter 12 "Earth years" , and Saturn takes 30 "Earth years". How often will Jupiter and Saturn align? (LCM)
a)
24
b)
60
c)
360
13.
What is the LCM of 16 and 24?
a)
24
b)
48
c)
8
14.
What is the prime factorization of 24?
a)
3 x 8
b)
3 x 2 x 2 x 2
c)
4 x 6
d)
2 x 2 x 3
15.
A prime number
a)
has one factor
b)
has more than 2 factors
c)
has 100 factors
d)
has exactly 2 factors: 1 and the number
16.
One is
a)
prime
b)
composite
c)
not prime or composite
d)
the loneliest number that you'll ever do
17.
What number is never allowed in a factor tree?
a)
13 (it's bad luck!)
b)
1
c)
8675309
d)
2
18.
Is 5 prime or composite?
a)
Prime
b)
Composite
19.
Is 35 prime or composite?
a)
prime
b)
composite
20.
Composite numbers:
a)
Are always bigger than prime numbers
b)
Have more than 2 factors
c)
Have 2 pairs of factors
d)
Don't have factors
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