Multiplying Rational Numbers

Warm Up

1. 2.

3. 4.

5. -1.8(5) 6. -2(-3.4)

7. 0.54(8) 8. -5(-1.2)

Kim borrows $4.25 from each of 3 friends. How much does she owe

in all?

A section of beach erodes meter per year. The beach erodes for 8 years. By how many meters did the length of the beach change?

-4(-2.5)

(12 )(−

14 )(− 25 )

Complete the Table

Sign of Factor p

Sign of Factor q

Sign of pq

+ +– ++ ––

Suppose we find the product of several rational numbers, one of

which is zero. What do you know about the product?

Greg sets his watch for the correct time on Wednesday. Exactly one

week later, he finds that his watch has lost minutes. If his watch

continues to lose time at the same rate, what will be the overall

change in time after 8 weeks?

For Home Economics class,Sandra has 5 cups of flour. She made3 batches of cookies that each used1.5 cups of flour. Write and solve an

expression to find the amount of flourSandra has left after making the 3

batches of cookies.

The ground temperature at BrighamAirport is 12 °C. The temperature

decreases by 6.8 °C for every increase of 1 kilometer above the

ground. What is the overall change in temperature outside a plane

flying at an altitude of 5 kilometers above Brigham Airport?

Exit Ticket1. 2. -3(-6.2)

3. In one day, Mr. Hanson spent $100.00 five times on his debit card. How much money was deducted from his account?

4. Ronnie cuts - inch sections of wood to make a birdhouse roof. He cut 36 sections. How many inches did he cut?