Build solid LCD habits with nine fill-in-the-blanks: rename a fraction by multiplying numerator and denominator, find the LCD of 3 and 7, rewrite 4/5 over 15, finish 2/9 + 5/6 as a mixed number, recall when answers can be simplified, compute 7/10 - 1/3, find the LCD of 8 and 12, finish 3/4 + 5/6, and name what kind of fraction appears when sums exceed 1.
Then a four-pair matching round links 3/7 + 1/2, 5/9 - 1/6, 4/5 + 1/3, and 7/8 - 3/10 to their simplified results. Fifth graders cement the rename-add-simplify rhythm that powers every unlike-denominator problem.
Style:
Adding and Subtracting Fractions with Unlike Denominators
Part A: Fill in the Blank
Write the missing word or number on each line.
1. To rename a fraction with a new denominator, multiply both the numerator and denominator by the same number.
2. The LCD of 3 and 7 is 21.
3. 45 rewritten with a denominator of 15 is 12 15 .
4. 29 + 56 = 418 + 1518 = 1118 as a mixed number.
5. After adding or subtracting fractions, always check if the answer can be simplified.
6. 710 − 13 = 2130 − 1030 = 1130.
7. The LCD of 8 and 12 is 24.
8. 34 + 56 = 912 + 1012 = 1712 as a mixed number in simplest form.
9. When the sum of two fractions is greater than 1, the result is an improper fraction or a mixed number.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
37 + 12
→ 1314
1215
59 − 16
→ 718
1314
45 + 13
→ 1215
718
78 − 310
→ 2340
2340
Adding and Subtracting Fractions with Unlike Denominators
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) To rename a fraction with a new denominator, multiply both the numerator and denominator by the same number.
2) The LCD of 3 and 7 is 21.
3) 4/5 rewritten with a denominator of 15 is 12/15.
4) 2/9 + 5/6 = 4/18 + 15/18 = 1 1/18 as a mixed number.
5) After adding or subtracting fractions, always check if the answer can be simplified.
6) 7/10 − 1/3 = 21/30 − 10/30 = 11/30.
7) The LCD of 8 and 12 is 24.
8) 3/4 + 5/6 = 9/12 + 10/12 = 1 7/12 as a mixed number in simplest form.
9) When the sum of two fractions is greater than 1, the result is an improper fraction or a mixed number.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
3/7 + 1/2
→ 13/14
1 2/15
5/9 − 1/6
→ 7/18
13/14
4/5 + 1/3
→ 1 2/15
7/18
7/8 − 3/10
→ 23/40
23/40
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