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Grade 5 Math · World 6: Fraction Market · Level 57
Common Denominators
Rename two fractions with the same denominator.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 57
- Thirds and fourths are different sizes, so they don't count together. We need to cut them into pieces of the same size.
- Look for a number both denominators go into. 3 and 4 both go into 12, so twelfths will work.
- Multiply top and bottom by the same number. That's the same as multiplying by 1, so the amount doesn't change.
- Do the same for 1 fourth. Now both fractions are in twelfths.
Georgia's K-12 Mathematics Standards:
- 5.NR.3.2 — Compare and order up to three fractions with different numerators and/or different denominators by flexibly using a variety of tools and strategies.
- 5.NR.3.3 — Model and solve problems involving addition and subtraction of fractions and mixed numbers with unlike denominators.