Ch 3 Review - 7th Pre-Algebra

Fractions and Decimals

100

Write the following as a decimal:

-4/5

-0.8

200

Write the following as a decimal:

5/6

0.833333...

300

Write the following decimal as a fraction:

-0.875

-7/8

400

Write the following decimal as a fraction:

0.193193193...

193/999

500

Use >, <, or = to compare the following:

-1.21  and  -1  1/5

-1.21 < -1  1/5

Multiplying Rational Number

100

7/8 • 2/35

1/20

200

-2/3 • 3/16

-1/8

300

-3/5 • -10/21

2/7

400

If x = 14/15, y=-1  2/5, and z = -3/7, find the following:

3/4 • x • y

-49/50

500

-9/10 • 7 • 2  1/3 • 1/21

-7/10

Dividing Rational Numbers

100

-4/5 ÷ 8/9

-9/10

200

7/9 ÷ -14

-1/18

300

-2  1/5 ÷ -3  2/3

3/5

400

4ab/c ÷ 3a/2c

8b/3

500

5a/3bc ÷ 2a/9bc

15/2 or 7  1/2

Adding/Subtracting Rational Numbers

100

2/9 + (-4/9)

-2/9

200

2  12/13 - (-7 10/13)

139/13 or 10  9/13

300

-8  3/10 - 4  9/10

-66/5 or -13  1/5

400

5  5/6 - (-2  1/4)

8  1/12

500

-5  3/5 + (-7  1/6)

-12  23/30

Reciprocals

100

Find the reciprocal of the following:

2/9

9/2 or 4  1/2

200

Find the reciprocal of the following:

-12/19

-19/12 or  -1  7/12

300

Find the reciprocal of the following:

-2  4/5

-5/14

400

Find the reciprocal of the following:

0.25

4

500

Find the reciprocal of the following. Be sure to simplify:

-1.76

-25/44