Multiplying and Dividing Integers & Rational Numbers

General Rules

100

(+) x (+) =

(+) or positive

200

(+) x (-) =

-

300

Tell whether the expression is positive or negative without evaluating.

-3/10 * (-8/15)

positive

400

How is multiplying and dividing rational numbers similar to multiplying and dividing integers?

The same rules for signs of integers are applied to rational numbers.

500

Tell whether the expression is positive or negative without evaluating.

-6/5-:(-1/2)*6.3*(-0.6)-:2/3*7 7/8-:100

negative

Multiplying/Dividing Decimals

100

-9 ÷ 1.5

-6

200

-0.8 x (-1.1)

-0.88

300

-0.3 * 5/6

-1/4

400

-9.01 x (-0.2)

1.802

500

24.75 ÷ 0.5

49.5

Multiplying Fractions

100

-5/8*1/2

-5/16

200

5/8*(-4/15)

-1/6

300

-3/5*2 2/7

-1 13/35

400

-2 3/8*(-1 3/5)

3 4/5

500

3 9/10*(-2 2/3)

-10 2/5

Dividing Fractions

100

-4/11-:2/7

-1 3/11

200

7/10÷(-5/2)

-7/25

300

9/10-:(-1 1/5)

-3/4

400

-1 5/6-:4 1/6

-11/25

500

-4 1/6-:1 1/3

-3 1/8