Review of Introductory Mathematics
Pertinent information concerning percentages and ratios is summarized below.
Percentages and Ratios Summary
Change decimals to percents by multiplying by 100 and
adding the percent symbol.
Change fractions to percents by first changing the fraction
into a decimal. Then change the decimal to a percent.
Compute percent differential by dividing the difference by
the original value, multiplying by 100, and adding the
Ratios are fractions written with a colon instead of a
division bar or slash.