GCF and LCM Review

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Find the GCF of
16, 28, and 48
16: 1, 2, 4, 8, 16
28: 1, 2, 4, 7, 14, 28
48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
GCF = 4
Find the GCF of
36, 72, and 120
12
36
72
120
3
6
10
Find the LCM of
10, 25, and 30
10: 10, 20, 30, 40, 50, 60, 70,
80, 90, 100, 110, 120, 130, 140,
150
25: 25, 50, 75, 100, 125, 150,
175, 200
30: 30, 60, 90, 120, 150
LCM = 150
Find the LCM of 4,
7, and 14
14: 14, 28, 42, 56
7: 7, 14, 21, 28, 35, 42
4: 4, 8, 12, 16, 20, 24, 28
LCM = 28
Claire takes private
swimming lessons every 6
days and piano lessons
every 4 days. In 60 days,
how often will she have
swimming lessons and
piano lessons on the same
day?
6: 6, 12, 18, 24, 30, 36, 42,
48, 54, 60
4: 4, 8, 12, 16, 20, 24, 28,
32, 36, 40, 44, 48, 52, 56, 60
5 times
Coach Crawford’s activity class
has 12 boys and 18 girls. He
wants to divide the class into
equal teams so that each team
has the same number of girls and
boys. What is the greatest
number of teams he can create?
How many girls and boys will be
on each team?
6
12
18
2
3
6 teams with 2 boys and 3 girls
on each team.

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