An acre is a unit of area used for measuring real estate. The word “acre” is an Old English word meaning “a field.” The acre was originally defined as the area that could be plowed in a day by a yoke of oxen. An acre is 43,560 square feet (4,840 square yards). There are exactly 640 acres in a square mile.
- How can U.S. money be used to measure items around the house?
- Why do cities have dams?
- How are carats and carob seeds related?
- Is a mile the same distance on land and at sea?
- How were stones used as weights and measures?
- What is a cubit?
- How are measuring units related to the human body?
- Is it possible to count to infinity?
- What is a googol?
- Why is learning math important?
- Is zero a number?
- What is an abacus, and how long has it been used?
- Which airport is the busiest in the world?
- What are Roman numerals?
- What is so special about the number 2?
- How long will it take me to count to one billion?
- Why is the number 10 important?
- What is a perfect number?
- What is Euclid’s Elements?
- Who was Pythagoras?


