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Choose Support for Unlike-Denominator Operations
Grade Level
ParaPro
PPM.143 Choose Support for Unlike-Denominator Operations
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A student says, 'For 5/6 - 1/4, I can just cross multiply.' Which response best aligns with this skill?
A
Use a twelfths model and ask the student to rewrite both fractions before subtracting.
B
Subtract the denominators after cross multiplying the numerators.
C
Tell the student to use denominator 10 because 6 + 4 = 10.
D
Use cross multiplication as the main method because it gives a quick answer for any fraction problem.
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