Percent

1
Percent
Chapter Seven
2
Percents, Decimals, and Fractions
Section 7.1
3
Understanding Percent
The word percent comes from the Latin phrase per
centum, which means per 100.
Percent means per one hundred. The symbol is
used to denote percent.
Martin-Gay, Prealgebra, 5ed
4
Writing a Percent as a Decimal
Replace the percent symbol with its decimal
equivalent, 0.01 then multiply.
43 43(0.01) 0.43
100 100(0.01) 1.00 or 1
Martin-Gay, Prealgebra, 5ed
5
Writing a Decimal as a Percent
Multiply by 1 in the form of 100.
0.65 0.65(100) 65. or 65
Martin-Gay, Prealgebra, 5ed
6
Writing a Percent as a Fraction
Replace the percent symbol with its fraction
equivalent, then multiply. Dont
forget to simplify the fraction, if possible.
43 43
Martin-Gay, Prealgebra, 5ed
7
Writing a Fraction as a Percent
Multiply by 1 in the form of 100.
Martin-Gay, Prealgebra, 5ed
8
Helpful Hint
We know that
100 1
Recall that when we multiply a number by 1, we
are not changing the value of that number.
Therefore, when we multiply a number by 100, we
are not changing its value but rather writing the
number as an equivalent percent.
Martin-Gay, Prealgebra, 5ed
9
Summary of Converting Percents, Decimals, and
Fractions

• To write a percent as a decimal, replace the
  symbol with its decimal equivalent, 0.01 then
  multiply.

• To write a decimal or fraction as a percent,
  multiply by 100.

Martin-Gay, Prealgebra, 5ed