Download Common Factors and GCF

Name _____________________________________________________________________________________________________
Common Factors and GCF
H 7-3
List the factors of each number. Then find the GCF of each set of numbers
1. 25, 34
2. 16, 20
1, 5, 25
34 1, 2, 17, 34
GCF 1
1, 2, 4, 8, 16
20 1, 2, 4, 5, 10, 20
GCF 4
25 16 3. 16, 28, 48
4. 20, 35, 70
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
16 5.
Draw a Venn diagram to show the
factors of 24 and 30.
What are the common factors?
What is the greatest common factor?
1, 2, 4, 5, 10, 20
35 1, 5, 7, 35
70 1, 2, 5, 7, 10, 14
35, 70
GCF 5
20 Factors
of
24
1, 2, 3, 6; 6
6.
4
8
12
24
1
2
3
6
5
10
15
30
Factors
of
30
A toy shop has 40 red marbles and 56 yellow marbles lying loose in a bin. The shop
owner wants to package them so that there are the same number of each per each bag.
How many bags will there be?
8
How many red marbles will be in each bag?
How many yellow marbles?
5
7
Test Prep Circle the correct letter for each answer.
7.
Which is the GCF for 12, 20, and 36?
A 12
8.
B 4
C 36
D 9
H 13
J 1
Which is the GCF for 5, 13, and 26?
F 5
© Scott Foresman, Gr. 5 (69)
G 2
Use with Chapter 7, Lesson 3.