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9.4/9.5 Add and
Subtract Mixed Numbers
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.
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?
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
Rename to Subtract
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
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
Independent Practice
• Solve:
– 8 - 3 3/10
– 5 - 1 4/5
– p. 193 (9-17 only - show all work)