Fraction Addition and Subtraction Quiz

Grade 5 · Math · Quiz

Test your skills adding and subtracting fractions with like and unlike denominators.

Questions

What is 5/8 + 1/8?
1. 6/16
2. 6/8
3. 3/4
4. Both B and C
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Answer: Both B and C
5/8 + 1/8 = 6/8, which simplifies to 3/4 by dividing by 2. Both 6/8 and 3/4 are correct.
What is the least common denominator of 1/3 and 1/5?
1. 8
2. 10
3. 15
4. 3
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Answer: 15
The LCD of 1/3 and 1/5 is 15 because 15 is the smallest number both 3 and 5 divide into evenly.
What is 7/10 - 2/5?
1. 5/5
2. 5/10
3. 3/10
4. 1/2
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Answer: 3/10
LCD is 10. Rename 2/5 as 4/10. Then 7/10 - 4/10 = 3/10.
What is 1/2 + 2/3?
1. 3/5
2. 3/6
3. 7/6
4. 1 1/6
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Answer: 1 1/6
LCD is 6. Rename: 3/6 + 4/6 = 7/6, which equals the mixed number 1 1/6.
Which fraction is equivalent to 3/4?
1. 6/10
2. 9/12
3. 4/5
4. 6/8 only
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Answer: 9/12
9/12 is equivalent to 3/4 because 9 ÷ 3 = 3 and 12 ÷ 3 = 4. (6/8 also equals 3/4 but was not an option by itself.)
A recipe calls for 2/3 cup of sugar. You already added 1/4 cup. How much more sugar do you need?
1. 1/12
2. 5/12
3. 3/7
4. 7/12
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Answer: 5/12
LCD is 12. Rename: 8/12 - 3/12 = 5/12 more sugar needed.
The simplest form of 6/9 is 2/3.
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Answer: True
The GCF of 6 and 9 is 3. Divide both by 3: 6 ÷ 3 = 2 and 9 ÷ 3 = 3, giving 2/3.
3/5 + 1/10 = ___ (write answer in simplest form).
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Answer: 7/10
LCD is 10. Rename 3/5 as 6/10. Then 6/10 + 1/10 = 7/10. Since 7 and 10 share no common factor, it is already in simplest form.