# Running Like a Monkey

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.

# Running Like a Monkey

December 14, 2018

When you want to get somewhere fast, you run — using your 2 legs. Well, that’s not how some people do it. As silly as it is, there’s a whole set of people who like to run on all fours, like a dog, cheetah or squirrel. A guy named Katsumi Tamakoshi holds the world record for running the 100-meter dash on his hands and feet. He did it in 15.86 seconds, beating record holder Kenichi Ito. This funny video shows Kenichi racing against 6 other people, all of them loping along like monkeys. Top athletes run the 100 meter on 2 legs in under 10 seconds, but clearly these guys aren’t in a hurry to get somewhere.

Wee ones: Hold up your hands. Now sit and hold up your feet. How many do you have of each?

Little kids: If you can run across the room in 8 seconds but crawl across in 11 seconds, which way takes longer?  Bonus: How long would it take to run across and then crawl back?

Big kids: Kenichi races against 6 other people in the video. How many total arms and legs do they have?  Bonus: If Katsumi runs the 100-meter dash in about 16 seconds, how fast could he run 1000 meters at the same pace?

Answers:
Wee ones: 2 hands, 2 feet.

Little kids: Crawling is slower!  Bonus: 19 seconds.

Big kids: 28 limbs (14 arms, 14 legs) for the 7 people in total.  Bonus: 160 seconds, since it’s 10 times as far.

### 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.