Dogs and cats usually don’t get along — except when they’re partners in crime. Pet owner Matt Hirst always closed the kitchen door before leaving the house, to keep his dog and cat in there. But when he got home, he always found the door open, and Dexter and Gizmo running all over the house. So he planted a camera to watch them, and solved the mystery. The cat, had figured out how to open the door. The dog cheers him on, but the cat is the brains of the operation. He had to do some math to get the right height and angles. Watch the secret video to see how these furry friends did it!
Wee ones: What shape are the markings on the door?
Little kids: The cat and dog each have 4 paws. How many different pawprints can they make in total? Bonus: If the cat is 12 inches tall and the dog is just 1 inch taller, how tall is the dog?
Big kids: If the cat tries 4 times to open the door and takes 20 seconds each time, how many seconds does the cat spend trying to break out? Bonus: If the dog were twice as tall as the cat, and stacked they could stand 42 inches tall, how tall would each one be?
Wee ones: Rectangles.
Little kids: 8 pawprints. Bonus: 13 inches.
Big kids: 80 seconds, or 1 minute 20 seconds. Bonus: The cat would be 14 inches, and the dog would be 28 inches. If the dog is twice as tall, stacking the two is like stacking 3 cats who total 42.
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.