When we think of whales, we picture big, round animals moving through the water. But not all whales are shaped like that. The fin whale is long and skinny, almost like an enormous eel. A marine biologist caught this amazing video of a fin whale hauling its 80-ton body out of the water. At 89 feet long it’s the second biggest animal on the planet! Even with that heavy body, fin whales can swim at nearly 30 miles an hour. Because of their speed and color they’re called “the greyhounds of the deep,” because greyhounds are dogs that run super fast (about 40 miles per hour). But a real greyhound might make an easier pet.
Wee ones: Fin whales are silvery-grey. Can you find 3 things in your room that are silver or grey?
Little kids: If a fin whale does 5 belly flops, what number is the second-to-last flop? Bonus: A fin whale can swim 23 miles an hour for a while, but for short bursts it can swim 6 miles an hour faster. What is the fastest it can it swim?
Big kids: Eels can be up to 13 feet long. How much longer is that 89-foot whale? Bonus: A fin whale weighs 80 tons! How many pounds is that? (Reminder: A ton equals 2,000 pounds.)
The sky’s the limit: If a whole bunch of kids lie end to end to be as long as that 89-foot whale, how many more 4-foot kids does it take to match the whale than 5-foot kids?
Wee ones: Items might include socks, shoes, aluminum foil, coins, or other metal objects.
Little kids: The 4th belly flop. Bonus: 29 miles per hour.
Big kids: 76 feet longer. Bonus: 160,000 pounds.
The sky’s the limit: 5 more kids. It takes 18 5-foot kids to make a chain longer than the whale, because 17 kids would be only 85 feet long. Then it takes 23 4-foot kids to be longer than 89, because 22 kids would be just 88 feet long. So we need 23 kids instead of 18.
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.