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Fraction Addition - Find Common Denominator - Basic - One Changed Denominator

Level 1

This math topic focuses on practicing the skill of finding the lowest common denominator for the purpose of adding fractions. It addresses basic introductory concepts within a larger unit on fraction addition and subtraction. Each question presents two fractions and asks to identify the appropriate common denominator from a list of multiple-choice options. This skill is foundational for effectively combining fractions with different denominators.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.

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Fraction Addition - Find Common Denominator - Basic - One Changed Denominator Worksheet

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Fraction Addition - Find Common Denominator - Basic - One Changed Denominator
1
What lowest common denominator would you use to add these fractions?
A LaTex expression showing 1 over 3 + 1 over 9
a
2
b
16
c
11
d
10
e
1
f
9
2
What lowest common denominator would you use to add these fractions?
A LaTex expression showing 1 over 5 + 1 over 10
a
17
b
14
c
5
d
10
e
8
f
3
3
What lowest common denominator would you use to add these fractions?
A LaTex expression showing 1 over 7 + 1 over 21
a
23
b
31
c
39
d
5
e
21
f
17
4
What lowest common denominator would you use to add these fractions?
A LaTex expression showing 1 over 7 + 1 over 14
a
11
b
9
c
6
d
14
e
17
f
12
5
What lowest common denominator would you use to add these fractions?
A LaTex expression showing 1 over 2 + 1 over 4
a
3
b
2
c
8
d
4
e
5
f
12
6
What lowest common denominator would you use to add these fractions?
A LaTex expression showing 1 over 5 + 1 over 15
a
19
b
16
c
15
d
14
e
8
f
24
7
What lowest common denominator would you use to add these fractions?
A LaTex expression showing 1 over 2 + 1 over 6
a
3
b
7
c
9
d
6
e
12
f
4
8
What lowest common denominator would you use to add these fractions?
A LaTex expression showing 1 over 3 + 1 over 6
a
1
b
11
c
3
d
6
e
13
f
4