Car Wash of Doom

Here's your nightly math! Just 5 quick minutes of number fun for kids and parents at home. Read a cool fun fact, followed by math riddles at different levels so everyone can jump in. Your kids will love you for it.

Car Wash of Doom

April 15, 2019

Today we have another Math Movie Monday, for Math Awareness Month! Today we see our friend Kevin take a job at the Car Wash of Doom. As you’d guess from the name, just about everything goes wrong at this car wash — and it would all go better if Kevin could do the math. Regular car washes do a pretty good job: there are more than 110,000 car washes in the US, and together they wash 8 million cars a day! Hopefully they do a better job than our friend here — watch to find out why!

Wee ones: Car washes use water. Run your sink faucet while you count to 10, then turn it off. Is the sink a little full, halfway full, or totally full? Try it again at a different speed!

Little kids: If Kevin’s power washer knocks off 2 front tires and 1 back tire, how many tires does he knock off? Bonus: If 8 fish come out of the hose and all but 3 of them squirt into the car, how many fish land in the car?

Big kids: Many car washes close during freezing weather. If your car wash runs from the start of March to the end of November, during how many months is it open? Bonus: If America washes 8 million cars a day, how many days would it take to wash a car for every one of our 320 million people? (Hint if needed: How many days would it take to wash 32 million cars? and then how does the answer differ?)










Wee ones: Different for everyone…see how fast your tub fills!

Little kids: 3 tires. Bonus: 5 fish.

Big kids: 9 months. Bonus: 40 days. It would take 4 days to wash 32 million cars, then you need 10 times as long for 10 times as many cars.

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About the Author

Laura Overdeck

Laura Overdeck

Laura Bilodeau Overdeck is founder and president of Bedtime Math Foundation. Her goal is to make math as playful for kids as it was for her when she was a child. Her mom had Laura baking before she could walk, and her dad had her using power tools at a very unsafe age, measuring lengths, widths and angles in the process. Armed with this early love of numbers, Laura went on to get a BA in astrophysics from Princeton University, and an MBA from the Wharton School of Business; she continues to star-gaze today. Laura’s other interests include her three lively children, chocolate, extreme vehicles, and Lego Mindstorms.

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