How long is a long-distance running race?
20 miles 20 yards 20 feet 20 inches
Select the best estimate.
Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means.
When you are using customary units, length may be written with units of inches, feet, yards, or miles.
There are 12 inches in 1 foot, and 3 feet in 1 yard. There are 5,280 feet in 1 mile.
A football is about 1 foot long. A football field is 100 yards long.
The best estimate for the length of a long-distance running race is 20 miles.
20 inches, 20 feet, and 20 yards are all too short.