Adding Fractions (Unlike Denominators)
Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions to produce a common denominator
Teaching approaches
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1 approach
If a recipe uses 2/3 of a cup of one ingredient and 3/4 of another, can your child add those fractions together — even though the denominators are different?
Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions to produce a common denominator
Learning resources
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3 before · 4 after
Before
This concept
Check understanding
- Compute 2/3 + 5/4 by converting to twelfths: 8/12 + 15/12 = 23/12
- Subtract 1 3/5 from 3 1/4 using a common denominator
- Explain the strategy of finding a common denominator and verify using a visual model
“If a recipe uses 2/3 of a cup of one ingredient and 3/4 of another, can your child add those fractions together — even though the denominators are different?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Fractions
- Age range
- Ages 10–11