The US also uses customary units. 1 foot = 12 inches, 1 yard = 3 feet and 1 pound = 16 ounces. Liquids can be measured in liters and milliliters: 1 liter = 1000 milliliters.
Converting works the same as with metric units. Multiply to change into a smaller unit and divide to change into a bigger one. 5 feet = 5 × 12 = 60 inches. A table of conversions helps you remember.
When a measurement is mixed, like 3 feet 4 inches, change the feet to inches and then add: 36 + 4 = 40 inches.
Worked example
How many inches are in 7 feet?
- 1 foot = 12 inches.
- 7 × 12 = 84.
Answer:84 inches
Key words
- foot (ft)
- 12 inches
- yard (yd)
- 3 feet
- pound (lb)
- 16 ounces
Practise this
New questions every time.
Common Core-referenced: 4.MD.A.1