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Unlike Denominators · Grade 5

Adding & Subtracting Fractions

Name Date Correct / 4
1 Shade it. Shade it before you compute it.
1. Shade 12 of the first square and 13 of the second. Which shows more?
More:
2. Draw fraction strips for 34 and 12. How much longer is 34?
Longer by:
2 Draw it. Use grids, strips or lists of multiples.
3. The grid shows sixths. Shade 12 and 13 in it, then add.
12 + 13 =
4. List multiples of 4 and 6 to find a common denominator. Circle the first match.
4:
6:
Common denominator =
Roots of Reason CA CCSS 5.NF.A.1 | 5.NF.A.2 rootsofreason.org · Page 1 of 4
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Unlike Denominators · Grade 5

Adding & Subtracting Fractions

Name Date Correct / 4
3 Numbers only. Rename, then add or subtract. Problems 9 to 12 use mixed numbers.
5. 13 + 14 =
6. 56 − 12 =
7. 25 + 12 =
8. 78 − 34 =
Roots of Reason CA CCSS 5.NF.A.1 | 5.NF.A.2 rootsofreason.org · Page 2 of 4
Roots of Reason
Roots of Reason
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Unlike Denominators · Grade 5

Adding & Subtracting Fractions

Name Date Correct / 4
3 Numbers only. Rename, then add or subtract. Problems 9 to 12 use mixed numbers.
9. 112 + 213 =
10. 314 − 112 =
11. 23 + 56 =
12. 416 − 223 =
Roots of Reason CA CCSS 5.NF.A.1 | 5.NF.A.2 rootsofreason.org · Page 3 of 4
Roots of Reason
Roots of Reason
rootsofreason.org
Answer Key
Unlike Denominators · Grade 5

Adding & Subtracting Fractions

1 Shade it
1. Shade 12 of the first square and 13 of the second. Which shows more?
More: 1/2
2. Draw fraction strips for 34 and 12. How much longer is 34?
Longer by: 1/4
2 Draw it
3. The grid shows sixths. Shade 12 and 13 in it, then add.
12 + 13 = 5/6
4. List multiples of 4 and 6 to find a common denominator. Circle the first match.
4: 4, 8, ⑫, 16, 20
6: 6, ⑫, 18, 24
Common denominator = 12
3 Numbers only
5. 13 + 14 = 7/12 6. 56 − 12 = 1/3 7. 25 + 12 = 9/10 8. 78 − 34 = 1/8
Mixed numbers: write them as improper fractions first.
9. 112 + 213 = 3 5/6 10. 314 − 112 = 1 3/4 11. 23 + 56 = 1 1/2 12. 416 − 223 = 1 1/2
If a student adds denominators in problem 5, do not reteach the rule. Send them back to the sixths grid in problem 3. The grid makes "you can only add matching pieces" impossible to miss.