Percent formulas
percent change = (new − original) / original × 100
part = (percent ÷ 100) × whole
"x% of y" = (x/100) × y
chained percents: a = (m/100)(n/100) × c
Unit conversion (dimensional analysis)
multiply by a conversion fraction so unwanted units cancel
area: square the linear conversion factor
volume: cube the linear conversion factor
Common factors used in this set
1 mile = 1,609 m | 1 km = 0.62 mi
1 yard = 3 ft | 1 mile = 1,760 yd
1 gallon = 3.79 L | 1 parsec = 3.26 ly
1 nautical mile = 1.852 km | 1 m = 100 cm