Math · Fractions
Adding and Subtracting Fractions with Unlike Denominators
Use common denominators to add and subtract fractions and mixed numbers.
- 🎓 Grade 5
- 🧮 Math
- 📐 5.NF.A.1
- ❓ 24 questions
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2/5 + 1/2 = ?
- A 3/10
- B 9/10
- C 3/7
- D 9/20
Common denominator 10: 4/10 + 5/10 = 9/10
3/4 − 1/3 = ?
- A 5/13
- B 2/12
- C 1 1/12
- D 5/12
Common denominator 12: 9/12 − 4/12 = 5/12
5/6 − 1/4 = ?
- A 7/12
- B 1 2/24
- C 4/12
- D 4/24
Common denominator 12: 10/12 − 3/12 = 7/12
3/8 + 1/4 = ?
- A 4/12
- B 4/8
- C 5/8
- D 4/32
Common denominator 8: 3/8 + 2/8 = 5/8
3 3/4 − 1 1/2 = ?
- A 1 1/4
- B 2 1/4
- C 1 3/4
- D 2 1/2
3 3/4 − 1 2/4 = 2 1/4
7/8 − 1/2 = ?
- A 3/9
- B 1 6/16
- C 6/8
- D 3/8
Common denominator 8: 7/8 − 4/8 = 3/8
2/3 + 4/5 = ?
- A 22/30
- B 1 7/15
- C 6/8
- D 6/15
Common denominator 15: 10/15 + 12/15 = 1 7/15
7/12 + 1/3 = ?
- A 8/15
- B 8/36
- C 8/12
- D 11/12
Common denominator 12: 7/12 + 4/12 = 11/12
2/9 + 1/3 = ?
- A 3/12
- B 5/9
- C 3/27
- D 3/9
Common denominator 9: 2/9 + 3/9 = 5/9
3/4 + 1/6 = ?
- A 4/10
- B 4/12
- C 11/12
- D 4/24
Common denominator 12: 9/12 + 2/12 = 11/12
1/2 + 3/10 = ?
- A 4/20
- B 4/10
- C 4/12
- D 4/5
Common denominator 10: 5/10 + 3/10 = 4/5
1/2 + 1/3 = ?
- A 2/5
- B 5/6
- C 2/6
- D 5/12
Common denominator 6: 3/6 + 2/6 = 5/6
Which is the best estimate of 7/8 + 5/6?
- A about 12/14
- B about 1
- C about 3
- D about 2
Both fractions are close to 1.
1/4 + 2/3 = ?
- A 3/12
- B 3/7
- C 11/24
- D 11/12
Common denominator 12: 3/12 + 8/12 = 11/12
2/3 − 1/5 = ?
- A 7/16
- B 13/15
- C 7/15
- D 1/15
Common denominator 15: 10/15 − 3/15 = 7/15
5/12 − 1/6 = ?
- A 1/4
- B 4/6
- C 4/72
- D 4/12
Common denominator 12: 5/12 − 2/12 = 1/4
1/2 + 1/3 = 2/5
False 1/2 + 1/3 = 3/6 + 2/6 = 5/6. 2/5 is less than 1/2, so it cannot be right.
11/12 − 2/3 = ?
- A 1/5
- B 9/12
- C 1/4
- D 1 21/36
Common denominator 12: 11/12 − 8/12 = 1/4
2 1/2 + 1 2/3 = ?
- A 3 1/6
- B 4 3/6
- C 3 3/5
- D 4 1/6
2 3/6 + 1 4/6 = 3 7/6 = 4 1/6
5/6 + 3/4 = ?
- A 1 7/12
- B 8/24
- C 8/10
- D 8/12
Common denominator 12: 10/12 + 9/12 = 1 7/12
1/3 + 1/6 = ?
- A 2/18
- B 2/9
- C 2/6
- D 1/2
Common denominator 6: 2/6 + 1/6 = 1/2
4/5 − 1/2 = ?
- A 3/11
- B 4/10
- C 3/10
- D 1 3/10
Common denominator 10: 8/10 − 5/10 = 3/10
9/10 − 2/5 = ?
- A 7/10
- B 1 2/5
- C 1/2
- D 7/50
Common denominator 10: 9/10 − 4/10 = 1/2
3/5 + 1/4 = ?
- A 4/9
- B 17/20
- C 4/20
- D 17/40
Common denominator 20: 12/20 + 5/20 = 17/20
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