Grade level: 3rd-5th

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.

1. How many quarts of water are used to brush teeth?
2. You have 30 cups of water. Do you have enough water for 2 gallons of water?
3. You have 10 pints of water. How many more pints of water do you need to make 2 gallons of water?
4. 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

1. 8 quarts
2. No (2 gallons=32 cups)
3. 6 pints (16-10=6)
4. 4 quarts

2 gallons.