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)