The post As Purple As a Tomato appeared first on Bedtime Math.

]]>Tomatoes are red, carrots are orange, and bananas are yellow, right? Well, what do you do with a yellow tomato or a purple carrot? You line them up in a rainbow to make amazing pictures like this one. Photographer Brittany Wright gathered up all kinds of fruits and veggies, each in a whole range of colors, and laid them out by shade to make stripy designs, like these fun hot peppers. Did you know that carrots were never orange on their own until about 400 years ago? They were always red, purple, yellow, or white, until the Dutch blended red and yellow to make orange for their royal family, the House of Orange. Now orange carrots look just fine!

*Wee ones:* If the citrus picture has grapefruits, oranges, lemons and limes, how many kinds of fruit is that?

*Little kids:* How many hot peppers can you count in the top picture? *Bonus:* If 5 of them have some green on their skin, how many don’t?* *

*Big kids:* A tomato photo on that page has 5 rows with 5 tomatoes in each. If you found 4 blue tomatoes to add on, how many would you have in total? *Bonus:* If you grab 12 carrots out of your fridge, and of those there are twice as many purple ones as orange ones (and no other colors), how many do you have of each color?

Answers:

*Wee ones:* 4 kinds of fruit.

*Little kids:* 12 peppers. *Bonus:* 7 peppers.

*Big kids:* 29 tomatoes, up from 25. *Bonus:* There are 8 purple and 4 orange carrots. The purple counts as 2 sets of orange, plus another set of orange makes 3 sets. So each “set” has 4 carrots, and purple ends up having 8.

The post As Purple As a Tomato appeared first on Bedtime Math.

]]>The post When Your Tail Really Counts appeared first on Bedtime Math.

]]>Looks like these ring-tailed lemurs really want to learn how to use that camera. And it turns out these silly, stripy goofballs are pretty smart: they can do math! Lemurs can count, add, and subtract, and can also line up objects in order from memory. Even their wild long tails have numbers behind them: the lemur’s tail always has 12 or 13 white rings and 13 or 14 black rings, and the tip always ends in black. Lemurs live on the island of Madagascar off the coast of Africa. It’s a beautiful place, so we can see why they’d like to take some pictures of it!

*Wee ones:* If the lemur’s tail has a black ring at the tip, then white, then black, then white, what’s the next ring?

*Little kids:* If a lemur’s tail has 12 white rings and 13 black rings, of which color does it have more? *Bonus:* If the 1st ring is black followed by white, then black, then white, and so on, what color is the 12th ring?

*Big kids:* If a lemur’s tail has 27 rings, and there’s 1 more black ring than white ring, how many rings of each color? *Bonus:* If a lemur is 18 inches long and its tail is another 1/3 body length longer than that, how long is the whole lemur from head to tail tip?

*The sky’s the limit*: We can’t tell you how many rings a baby lemur’s tail has, but if you took that number, multiplied it by itself, and added 9, you’d get 58. How many rings does the tail have?

Answers:

*Wee ones:* A black ring.

*Little kids:* More black rings. *Bonus:* White.

*Big kids:* 14 black rings and 13 white. If you took off that extra black ring, you’d have 26 rings that are equally black and white, so then you just cut 26 in half to find the white. *Bonus:* 42 inches, since it’s 18 plus 24.

*The sky’s the limit:* 7 rings. If you walk backwards, the number times itself comes to 49 (58-9), and 49 is divisible only by 7, so that’s your answer!

The post When Your Tail Really Counts appeared first on Bedtime Math.

]]>The post Backwards-Brain Bike appeared first on Bedtime Math.

]]>Have you ever ridden a bike? Once you learn how to do it, it seems easy. But imagine trying to ride this backwards bike. When you turn the handlebars left, the bike turns right, and when you turn them, right, the bike curves left. Destin of Smarter Every Day built this bike and found out that it’s really hard to make your brain work backwards. He practiced every day for 8 months before he could do it! Guess what: he then tried to ride a regular bike and couldn’t do it anymore! He had to retrain his brain. Destin has told people that if they can ride the bike 10 feet on the first try without falling down, he’ll pay them $200…and as we see in the video, no one has done it. But feel free to try!

*Wee ones:* If you turn left, then right, then left, then right, then left…which way do you turn next?

*Little kids:* If you try to ride the 10 feet to win the $200, but you fall down 2 feet before the end, how far did you ride? *Bonus:* If he took 8 months to make his brain work starting in August, when did he finally succeed?

*Big kids:* If 3 people ride to the finish without falling down, how much money does Destin have to pay out? *Bonus:* If he has $1,000 in total to give as prizes, and you’re the first winner, how many more bike-riders could he pay at $200 apiece?

Answers:

*Wee ones:* You turn right.

*Little kids:* 8 feet. *Bonus:* The following April.

*Big kids:* $600. *Bonus:* 4 more riders, since he can handle 5 at most.

The post Backwards-Brain Bike appeared first on Bedtime Math.

]]>The post Don’t Trip over Your Tongue! appeared first on Bedtime Math.

]]>Who has the longest tongue? It may be 20-year-old Adrianne Lewis, whose tongue sticks out 4 inches past her mouth. She can lick her own nose, chin, eyeball, and even her elbow. Just about no one can do that last one — try licking your own elbow! But some animals do much better. The honey bear’s tongue is 5 inches, when the whole bear is just 20 inches long — it’s 1/4 of its whole height! The real winner may be the anteater, whose tongue can be as long as its whole head and stick out 2 feet! The anteater uses it to eat, you guessed it…ants. We people would probably rather lick our eyeballs.

*Wee ones:* Try to lick your left elbow. Now try to lick your right elbow! Did you reach either one?

*Little kids:* If your tongue is 3 inches long and it needs to be 7 inches long to reach your eyeball, how much longer a tongue do you need? *Bonus:* If your pet anteater’s tongue is 3 times as long as your 3-inch tongue, how long is it?

*Big kids:* If you lick your eyeball, then your chin, then your nose, then your elbow, then start over with your eyeball to repeat…which part gets the 27th lick? *Bonus:* If YOUR tongue were 1/4 as long as your whole body, how long would it be in inches? (*Hint if needed:* To divide by 4, which is 2 x 2, you can cut the number in half, then cut in half again.)

*The sky’s the limit:* If your pet anteater’s body and its tongue are together 80 inches long, and the body is 3 times as long as the tongue, how long is each one?

Answers:

*Wee ones:* See if you can learn your right from left!

*Little kids:* 4 inches longer. *Bonus:* 9 inches.

*Big kids:* Your nose, since it’s before your elbow which lands on all the multiples of 4 (including 28). *Bonus:* Different for everyone…divide your height (or the closest multiple of 4) by 4.

*The sky’s the limit:* The tongue is 20 inches, and the body is 60 inches. The body is like 3 tongues, so the body plus the tongue are like *4* tongues all together. These 4 tongue lengths add up to 80 inches. So 1/4 of 80 is 20 inches for 1 tongue.

The post Don’t Trip over Your Tongue! appeared first on Bedtime Math.

]]>The post Donut in Outer Space appeared first on Bedtime Math.

]]>The donut has been a favorite treat for hundreds of years. But we bet you’ve never tried to shoot one into outer space. Two brothers, Alexander and Benjamin Jönsson, took a yummy glazed donut with sprinkles, stuck it on a plastic shelf with a camera, and strapped the whole thing to a weather balloon. The balloon carried the donut more than 20 miles up into the sky! The spinning camera caught amazing video of the sky, the Sun and Earth below all swinging by. 5 hours later the donut landed in a lake, and became the farthest flying astro-donut ever.

*Wee ones:* What shape is that kind of donut?

*Little kids:* If you launched a donut, 2 cookies and a brownie into space, how many astro-snacks is that? Bonus: If the donut had taken off at 1:00 in the morning and flown 5 hours, would it have landed in time for your 7:00 am breakfast?

*Big kids:* Regular airplanes fly about 7 miles above Earth. This donut flew 20 miles high. If you flew halfway between the two, how high would you be? Bonus: If the donut faced the Sun at 3:00 pm and spun all the way around every 4 minutes (at a constant speed), was it facing towards or away from the Sun at 3:18?

*The sky’s the limit, even for donuts…:* If the donut traveled for 5 hours in total, but within that spent 9 times as long floating up as falling back down (with no break in between), how much of the trip did it spend falling?

Answers:

*Wee ones:* The donut is a circle…and the grown-up word for a tube wrapped end to end into a circle is a “torus.”

*Little kids:* 4 astro-snacks. Bonus: Yes, since it would have landed at 6:00 am.

*Big kids:* At 13 1/2 miles. The gap between the two is 13, and half of that is 6 1/2 miles. You can then add 6 1/2 to 7, or subtract it from 20. Bonus: Facing away, since it would face the Sun at 3:16 and 3:20.

*The sky’s the limit:* 1/2 hour. If the donut spends 9 parts of the trip going up and 1 part going down, that makes 10 equal parts in total, where it spends 9/10 of the trip going up and 1/10 falling. 1/10 of 5 hours is 1/2 hour.

The post Donut in Outer Space appeared first on Bedtime Math.

]]>The post Doggy Paddle Like a Pro appeared first on Bedtime Math.

]]>Do you know how to swim? It’s a very exciting moment when you finally learn how. Dogs seem to feel the same way, as in this video of 8 golden retriever puppies. Just like people, some take a while to dip in a paw, while a brave one jumps right in. Dogs love to swim, and golden retrievers are among the top 10 breeds (types) of dog that do it best. Poodles swim well, too — did you know that their name and the word “puddle” both come from the German word for “splash”? If you’d like to learn how to doggy paddle, learn from the pros!

*Wee ones:* Pretend you’re doing the doggy paddle. Paddle with your right “paw,” then your left paw!

*Little kids:* If 8 puppies go for a swim, what numbers do you say to count them? *Bonus:* If 8 puppies jump in, then 2 climb out, then 1 jumps back in, how many are now in the pool?

*Big kids:* How many swimming paws do those 8 puppies have? *Bonus:* If there are 20 legs in the pool including the 4 people training them, how many puppies are in?

*The sky’s the limit: *If there are 60 paws in the pool, and within that there are twice as many poodle paws as golden retriever paws, how many poodles are in the pool?

Answers:

*Wee ones:* See if you know your right hand from your left.

*Little kids:* 1, 2, 3, 4, 5, 6, 7, 8. *Bonus:* 7 puppies.

*Big kids:* 32 paws. *Bonus:* 3 puppies, since the people take up 8 legs, leaving 12 puppy legs.

*The sky’s the limit: *10 poodles (and 5 golden retrievers). If there are twice as many poodle paws as golden paws, it’s like having a set of golden paws plus 2 more equal sets of poodle paws, or 3 equal sets together. So we take 1/3 of 60, which is 20, giving us 20 golden paws. That leaves us 40 poodle paws on 10 poodle, since each dog has 4 paws.

The post Doggy Paddle Like a Pro appeared first on Bedtime Math.

]]>The post Don’t Bite the Robot That Feeds You appeared first on Bedtime Math.

]]>This might be the weirdest robot we’ve seen yet. Tomatan is a tomato-tossing robot for marathon runners. A marathon is 26 miles long, and it’s really hard to run that far. When the runner squeezes one of Tomatan’s feet, Tomatan grabs a tomato out of its own backpack, swings it overhead and holds it to the runner’s mouth. As we see in the video, the runner can just keep running while munching! You probably never thought you could have a backpack robot — but you also probably never thought you’d want to eat tomatoes while running. Now you can do both.

*Wee ones:* What shape is a tomato?

*Little kids:* If Tomatan could feed you 2 tomatoes and then 5 bananas, how many pieces of food would he hand you? *Bonus:* If you want to eat 10 things in total, how many more pieces of food should Tomatan feed you?

*Big kids:* If you run 26 miles and eat a tomato every 3 miles, can you eat all 10 tomatoes before you finish the race? *Bonus:* If you eat 2 tomatoes during each and every mile, how many do you chug down in total?

Answers:

*Wee ones:* It looks like a circle from the side, and it’s also a sphere (a ball)…or if you want to get fancy, a spheroid (a squashed sphere, since most tomatoes aren’t perfect).

*Little kids:* 7 pieces. *Bonus:* 3 more pieces.

*Big kids:* No: even if you eat one at the start (0 miles), you’ll have had 2 tomatoes after 3 miles, 3 after 6 miles, and so on, giving you only 9 by 24 miles. *Bonus:* 52 tomatoes.

The post Don’t Bite the Robot That Feeds You appeared first on Bedtime Math.

]]>The post High-Flying Jump appeared first on Bedtime Math.

]]>Jumping on a trampoline can make you feel like a superhero. Just one little push-off and you’re flying higher than anybody on the ground. With all that time hanging in the air, you can do flips, bounce onto your knees, or land in a handstand. There are world records for the longest time jumping, the most one-legged jumps, and even the “Fastest Time to Dress in Formal Attire While Jumping on a Trampoline.” Even dogs are getting into the act: check out this video of a Great Dane (a really huge dog) doing some jumps himself!

*Wee ones:* Jump as high as you can from the floor. Now do 2 more jumps! How many jumps did you do?

*Little kids:* If you and your pet dog jump on the trampoline, how many legs do you have in total? *Bonus:* If you jump for 20 seconds and count down from 20, what are the first 10 numbers you say?

*Big kids:* If you’re in the air 4 seconds per jump, and you need 8 seconds in the air to pull on pants, 12 seconds to pull on a shirt, and 8 seconds to pull on socks, how many jumps do you need to get dressed in the air? *Bonus:* In one world record, Ken Kovach spun a hula hoop 130 times around himself while jumping. If he did 2 spins per second, how long did it take him to set the record?

Answers:

*Wee ones:* 3 jumps.

*Little kids:* 6 legs. *Bonus:* 20, 19, 18, 17, 16, 15, 14, 13, 12, 11.

*Big kids:* 7 jumps (2 + 3 + 2). *Bonus:* 65 seconds.

The post High-Flying Jump appeared first on Bedtime Math.

]]>The post Real Quadruple Rainbow appeared first on Bedtime Math.

]]>Have you ever seen a real rainbow? Maybe a little one on the wall from sun shining through angled glass, or a giant one in the sky (which you find by standing with your back to the sun, then looking forward 40 degrees to your left and right). A single rainbow has stripes of all the colors — red, orange, all the way to violet — but sometimes it’s stacked under another backwards rainbow that runs from violet to red. That’s called a double rainbow, and it’s very special because it’s so rare. That’s why people love this photo of two double rainbows. Amanda Curtis saw it over a train station in Long Island and quickly snapped a picture. No one is sure how the sun made these shapes, but we’re lucky the camera caught it before they disappeared.

*Wee ones:* A rainbow has red, orange, yellow, green, blue, and purple. Try to find 1 thing in your room of each color. How many things did you find in total?

*Little kids:* Some say the rainbow has 1 more color than the above: “indigo” (between blue and purple). How many colors does that rainbow have? *Bonus:* You can take any 2 of the “primary” colors — red, yellow and blue — and mix them to make a “secondary” color (like orange, which mixes red and yellow). How many different pairs of primary colors can you choose to mix?

*Big kids:* If you could see 7 sharp stripes in each of the 4 rainbows here, how many colored stripes would you see in total? *Bonus:* Rainbows in the sky usually don’t last long. If the rainbow appeared at 6:58 pm and lasted just 5 minutes, when did it disappear?

Answers:

*Wee ones:* 6 things, if you find one of each of those colors. Items might include socks, Lego blocks, other toys, and book covers.

*Little kids:* 7 colors. *Bonus:* 3 pairs: red+yellow, yellow+blue, and red+blue. Those give you orange, green and purple — the other 3 colors in the 6-color rainbow!

*Big kids:* 28 stripes. *Bonus:* At 7:03 pm.

The post Real Quadruple Rainbow appeared first on Bedtime Math.

]]>The post Geckos, Dragons, Chameleons, Oh My! appeared first on Bedtime Math.

]]>So what’s the difference between geckos, lizards, Komodo dragons, salamanders, chameleons, and other wiggly creepers? It turns out that all but one are in the same big happy family: the lizard family. Lizards are reptiles, like snakes, alligators and turtles. They are all cold-blooded, so they have to lie in the sunshine to warm up. There are over 6,000 species (types) of lizard: some geckos and chameleons are just a few inches long, while the biggest lizard, the Komodo dragon, can be 9 to 10 feet long! Meanwhile, one slinky four-footed friend, the salamander, isn’t part of the family. It’s an amphibian, meaning it can live in the water or on land. It doesn’t have scales like the lizards, but we think it gets the last laugh.

*Wee ones:* Lizards have 4 feet. Who has more, you or a lizard?

*Little kids:* Chameleons change color to hide and also to show they’re angry. If you have 5 chameleons and 2 of them turn dark, how many of them are still happy? *Bonus:* How many feet do the 2 angry ones have altogether?

*Big kids:* If you have the longest chameleon possible — 27 inches — and it’s 9 times as long as your pet gecko, how long is the gecko? *Bonus:* If you also have a 10-foot pet Komodo dragon, how much longer than you is that dragon, in inches?

Answers:

*Wee ones:* The lizard!

*Little kids:* 3 happy chameleons. *Bonus:* 8 feet.

*Big kids:* 3 inches. *Bonus:* Different for everyone…subtract your height (length) from 120 inches.

The post Geckos, Dragons, Chameleons, Oh My! appeared first on Bedtime Math.

]]>