Multiplying Rational Numbers

Say it as multiplication and solve

100

(-6) + (-6) + (-6) + (-6) + (-6) =

(-6) x 5 = -30

200

(-8) x (-8) x (-8) =

(-8) x 3= -24

300

9 inches of water drained out of the pool every hour for 9 hours

(-9) x 9 = -81

400

G withdrew 5 dollars from his bank account every day for 5 days.  How much did his account balance change in 5 days?

(-5) x 5= -25

500

In late December the average temperature dropped 0.5 degrees a day for 14 days.  How much did the temperature change during that time?

(-0.5) x 14 = -7

Multiplying Fractions

100

(-1/3) x (-1/4)=

1/12

200

(-3/4) x (4/5)=

-12/20  or -3/5

300

(8/12) x (-1/3)= 

-8/36 or -2/9

400

(-1 1/2) x (2)=

-6/2  or -3

500

(-4 1/4) x (-3) =

51/4

Multiplying Decimals

100

(1.5) x (-4) = 

-6

200

(2.4) x (-1.2) =

-2.88

300

(-8.8) x (2)= 

-17.6

400

(-1.25) x (-0.25) =

0.3125

500

(3.14) x (0.25)= 

0.785

Multiplying 3 or more

100

(-4) x (-2) x (-1) =

-8

200

(7) x (-3) x (-2)=

42

300

(-8) x (-3) x (2) =

48

400

(3) x (-3) x (3) x (-3) =

81

500

(-4) x (-2) x (-2) x (4)=

-64

Say it as addition and solve

100

(4) x (-9) =

-9 + -9 + -9 + -9 = -36

200

(-8) x 3=

-8 + -8 + -8 = -24

300

J lost 2 marbles a day every day for 4 days

-2 + -2 + -2 + -2 = -8

400

3 centimeters of water evaporated from the pool every week for 6 weeks. How many total centimeters lost?

-3 + -3 + -3 + -3 + -3 + -3= -18

500

Each hour the temperature dropped 2.5 degrees for 4 hours.  How much did the temperature drop during that time?

-2.5 + -2.5 + -2.5 + -2.5= -10