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9.4/9.5 Add and Subtract Mixed Numbers
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The “Bird Problem” A flock of birds is migrating from Canada to Florida for the winter. One day they fly 2 and 3/4 hours before stopping to rest. Then they fly 1 and 1/6 more hours. For how long do the birds fly? Discuss with your partner TWO different ways this problem can be solved.
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Estimation Practice Solve 1 and 1/2 minus 1 and 1/10. Solve 18 and 9/10 minus 13 and 2/5. How are adding and subtracting mixed numbers similar?
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Independent Practice Write the sum or difference in simplest form: – 1 5/12 + 1 1/4 –7 3/4 + 3 2/5 –5 5/6 - 2 7/9 –4 1/3 - 2 1/4
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Rename to Subtract
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Carrying Carrying involves carrying the fraction equivalent of 1 to the whole number part of the mixed number. 3 3/5 + 2 3/5 4 3/8 + 5 7/8 6 4/7 + 5 5/7
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Borrowing Borrowing involves borrowing the fraction equivalent of 1 from the whole number part of the mixed number 7 3/5 - 4 4/5 8 5/8 - 2 7/8 9 3/10 - 4 7/10
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Independent Practice Solve: –8 - 3 3/10 –5 - 1 4/5 –p. 193 (9-17 only - show all work)
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