Fractions
Subtract mixed numbers
Subtract whole and fractional parts, with focused practice that can include exchanging a whole when needed.
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Subtract whole and fractional inches
Subtract mixed inch measurements, exchanging a whole inch for fractional parts when the calculation requires it.
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Use a common denominator for the fractional inch parts. If needed, rename one whole inch as fractional parts before subtracting. Reduce the result and include its measurement unit.
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Customize this worksheetLearning objective
What this activity builds
Preserve a measured length while regrouping whole inches into the fractional unit needed for subtraction.
Worked example
Find 8 1/4 inches minus 3 5/8 inches.
4 5/8 inches.
Rename 8 1/4 as 8 2/8, then exchange one inch to get 7 10/8. Subtracting 3 5/8 leaves 4 5/8 inches.
Teaching notes
Make the practice count
- Compare fractional parts only after their denominators agree.
- Show the whole-inch reduction and fractional increase together.
- Use addition to check the final measured difference.
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