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Grade 5 Math · World 6: Fraction Market · Level 63
Mixed Numbers
Add and subtract mixed numbers with unlike denominators.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 63
- Mixed numbers have wholes and parts. Let's add 2 and 1 half plus 1 and 1 third. Add the wholes first: that's 3.
- Add the fractions. One half is 3 sixths, and 1 third is 2 sixths, so that's 5 sixths.
- Put them together: 3 and 5 sixths.
- Subtracting may need regrouping. In 3 and 1 fourth minus 1 and 1 half, write 1 fourth minus 2 fourths. There aren't enough fourths, so trade one whole for 4 fourths.
- Now it's 2 and 5 fourths minus 1 and 2 fourths, which is 1 and 3 fourths.
Georgia's K-12 Mathematics Standards:
- 5.NR.3.3 — Model and solve problems involving addition and subtraction of fractions and mixed numbers with unlike denominators.