Simple math

U.S.  Measures

Length

1 foot (ft) = 12 inches (in)
1 yard (yd) = 3 feet
1 yard = 36 inches
1 mile (mi) = 5280 feet
1 mile = 1760 yards

Liquid

1 cup = 8 fluid ounces
1 pint (pt) = 2 cups
1 quart (qt) = 2 pints
1 gallon (gal) = 4 quarts

Weight

1 pound (lb) = 16 ounces
1 ton (T) = 2000 pounds

Metric Measures

Length

1 centimeter (cm) = 10 millimeters (mm)
1 meter (m) = 100 centimeters
1 meter = 1000 millimeters
1 kilometer (km) = 1000 meters

Liquid

1 liter (L) = 1000 milliliters (mL)
1 milliliter = 1 cubic centimeter (cm3)

Time

1 minute (min) = 60 seconds (s)
1 hour (h) = 60 minutes
1 day = 24 hours
1 week (wk) = 7 days
1 year (yr) = 12 months (mo)
1 year = 52 weeks