Review of Introductory Mathematics
This chapter covers the conversion between percents, decimals, and fractions.
CONVERT between percents, decimals, and fractions.
CALCULATE the percent differential.
A special application of proper fractions is the use of percentage. When speaking of a 30% raise
in pay, one is actually indicating a fractional part of a whole, 30/100. The word percent means
"hundredth;" thus, 30% is based on the whole value being 100%. However, to perform arithmetic
operations, the 30% expression is represented as a decimal equivalent (0.30) rather than using
the % form.
Calculator Usage, Special Keys
When pressed, the percent key divides the displayed number by 100.
Changing Decimals to Percent
Any number written as a decimal may be written as a percent. To write a decimal as a percent,
multiply the decimal by 100, and add the percent symbol.
Change 0.35 to percent.
0.35 x 100 = 35%
Change 0.0125 to percent.
0.0125 x 100 = 1.25%