Water Wasters
Math Activity
Students will be surprised by how much water they can save if they brush their teeth
without leaving the water running.
WHAT YOU NEED
 Clean, empty onequart milk cartons
 New toothbrushes
 Toothpaste
WHAT TO DO
 Have students work in groups of three for this activity.
 One student brushes his or her teeth with the water running.
 Another student fills containers with the running water until the toothbrusher has finished.
 The third student keeps track of how many quart containers are filled.
 Use the information from this activity to solve some math problems, which will in turn help students
visualize how much water can be wasted on a daily task.
SAMPLE PROBLEM
How many quarts of water does your family use for brushing teeth each day?
Possible solution:
Students may break the problem into the following steps:
 Multiply the number of family members by the number of times each person brushes his or her teeth per day.
 Then multiply the result by the total number of quarts of water the student group collected during one brushing.
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