*Skills: Measurement (volume)*

*Related environmental issues: Water*

*Area level: household*

People in the United States, on average, uses 2 gallons of water for brushing teeth every time.

- How many quarts of water are used to brush teeth?
- You have 30 cups of water. Do you have enough water for 2 gallons of water?
- You have 10 pints of water. How many more pints of water do you need to make 2 gallons of water?
- When you use a newer model of faucet, you use 1 gallon of water for brushing teeth every time. How many quarts of water can you save by replacing your faucet?

Source: U.S. Geological Survey

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Answer keys

- 8 quarts
- No (2 gallons=32 cups)
- 6 pints (16-10=6)
- 4 quarts

2 gallons.