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Real-Life Activities

Real-Life Math -- Solution

You're investigating the weight and battery life of your latest invention -- a robotic dog. Figuring out the weight is a simple matter of addition:

1.3 pounds plastic
0.4 pounds fake fur
0.5 pounds electronics
0.2 pounds batteries
__________________
= 2.4 pounds

Your dog will weigh 2.4 pounds. That's well within the weight recommendations for the age group. Now, figuring out the battery use will require using that figure:

2.4 pounds x 34 minutes per pound = 81.6 minutes

Since that exceeds the recommendation, you have a choice. You can either make the dog lighter and extend its life, or you can continue with the prototype and get a clearer idea of how long the battery will really last by testing it.

Toy inventor David Silverglate uses math a lot. He designs flying toys. Math skills can be important, he says, depending on the kind of toys you're designing.

"I'm a physicist, [so] I use math a lot. Flying toys require more math and science than others," he says.


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