5th Grade · Number & Operations—Fractions
Unlike Denominators
5.NF.A.1
Definition
Fractions whose denominators are different, requiring a common denominator to combine.
Examples
- 1/3 and 1/4 have unlike denominators (3 and 4).
- 2/5 and 3/10 have unlike denominators (5 and 10).
Key rule
Rewrite fractions with a common denominator before adding or subtracting.
Memory hook
Different bottoms — find a common one first.