Fraction Decimal Percent and Percent of

Decimal-Percent

100

0.2

20%

200

0.06

6%

300

0.875

87.5% OR 88%

400

0.66666666666666666666666.........

66.7% or 67%

500

What is the general rule for converting a decimal into a percent?

Times by 100

Percent-Decimal

100

55%

.55

200

34.7%

.347

300

3%

0.03

400

150%

1.5

500

What is the general rule for converting a percent into a decimal?

Divide by 100

Fraction-Decimal

100

3/4

0.75

200

3/5

0.6

300

1/100

0.01

400

1/3

0.3333333333333333

500

When in doubt, what is a general rule for converting a fraction into a decimal?

Divide top by bottom

Decimal-Fraction

100

0.1

1/10

200

0.13

13/100

300

0.85

17/20  or 85/100

400

0.04

4/100

500

What is a general rule for converting a decimal into a fraction?

Times by 100, then show over 100

Percent <--> Fraction

100

30%

3/10 or 30/100

200

50%

1/2 or 50/100

300

5%

1/20  or 5/100

400

17%

17/100

500

102%

102/100 or 51/50 or 1 1/50

Percent of...

100

10% of 50

5

200

100% of 67

67

300

5% of 200

10

400

30% of 120

36

500

22% of 55

=10%+10%+1%+1%

= 5.5+5.5  +  0.55+0.55

= 12.1