How long is the Great Wall of China?
13,000 feet 13,000 inches 13,000 yards 13,000 miles
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 the Great Wall of China is 13,000 miles.
13,000 inches, 13,000 feet, and 13,000 yards are all too short.