This Week From Bedtime Math: Hot Enough to

Sometimes, going outside during the summer feels like walking into an oven. Find out just how much the temperature adds up to in today&s math problem.
By Laura Overdeck
Jul 23, 2013



Jul 23, 2013

What is Bedtime Math? A message from Laura: Bedtime Math is a pretty simple idea: We all know we should read to our kids at night, but what about math? My husband and I have done fun, mischief-loaded math problems with our kids at night for years, and when at age 2 our third child started hollering for his own math problem, we realized we were onto something:  In a world where so many people say, "Ewww, math!" we had created a household culture where kids don't just tolerate math, they actually seek it out. Now we email parents a fun, lively math problem every day to do with their kids – and every week, we'll be posting a new problem right here on Scholastic Parents!
When it's really warm outside and there's no breeze, objects in the sun can get really, really hot.  If you've ever walked outside barefoot in the summer, you know how burning hot the pavement can get, and people will tell you the hood of the car is so sizzling you can fry an egg on it.

So, just how hot can your car get after spending hours in the sun?  And can you really fry an egg on it?  The Bedtime Math team went exploring with a "remote thermometer" (pictured), which shines a laser beam at the object and tells you its surface temperature – a pretty cool gadget on a hot day.  We found that on a 90-degree day, the driveway got as hot as 150 degrees!  The roof of the car got even hotter at 156 degrees.  We did crack an egg on it to see if it would cook…the edges kind of turned white, but it probably needed to cook more to taste good.  If you're going to try it, though, we recommend washing the car first. With that warm-up, try challenging your kids with these math problems:

Wee ones (counting on fingers): If your friend wants 4 eggs off the hood of the car and you want 1, how many eggs should you cook?

Little kids: If your body temperature is 98 degrees and the sidewalk reaches 93 degrees, how much warmer are you than the sidewalk?  Bonus: If you test yourself to see how tough your feet are, and you find you can walk on pavement 10 degrees hotter than you, how hot is the pavement?

Big kids: If the street reaches 139 degrees and your car hits 157 degrees, how much hotter is the car than the street?  Bonus: If the car needs to reach 192 degrees to fry an egg properly, how much hotter does the car need to get?

Wee ones: 5 eggs.
Little kids: 5 degrees warmer.  Bonus: 108 degrees.
Big kids: 18 degrees hotter.  Bonus: 35 degrees hotter to fry an egg.

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