The post Photo-Fest appeared first on Bedtime Math.

]]>It’s easy to snap pictures of anything these days, because so many phones can work like cameras. In the old days, taking a picture was so hard! The light bounced into a black box, where it hit a clear plastic film covered in chemicals. It took time for the chemicals to change color, so the person in the photo had to stand still for whole minutes without moving at all. Now it all happens in a split second with electronics. So our fan Yuri R. S. asked, how many pictures are taken every year around the world? Unbelievably, it’s 1 trillion or more (1,000,000,000,000). But with almost 7 billion cell phones out there, that comes to only about 140 photos per person per year. When that many people are snapping selfies, the photos stack up fast!

*Wee ones:* The lens of a camera (where the light goes in) is usually a circle. See if you can spot 3 circle shapes in your room.

*Little kids:* If you take 1 picture each day this week, how many do you take? *Bonus:* If you take pictures of 2 people, and each of them takes pictures of 2 people, how many people got to pose for a picture?

*Big kids:* There are 8 billion people in the world, and 7 billion cell phones. If 2 billion people each had 2 of those phones, how many people would have no phone at all? *Bonus:* If 300 million Americans each took 10 pictures this week, how many pictures would that come to?

__Answers:__

*Wee ones:* Answers might include buttons, shoelace holes, the bottom of a cup, or the face of a clock.

*Little kids:* 7 pictures. *Bonus:* 6 people, since you took pictures 2 and your friends took pictures of 4 more.

*Big kids:* 3 billion people. The 2 billion people would have 4 billion of the phones, leaving only 3 billion more phones for 3 billion more people. Only 5 billion total would have a phone. *Bonus:* 3 billion pictures.

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]]>The post A Leafy Game of Leapfrog appeared first on Bedtime Math.

]]>This frog is green, just like a frog should be. But he doesn’t look as smooth and slimy, does he? That’s because this is a bush trimmed to look like a frog. Plants of other colors are growing right up the side to make his mouth and belly. “Topiary” is the art of cutting bushes and other plants to make shapes. They can turn into anything from animals to houses to grand pianos. This frog and the horses above live at the Montreal Botanical Garden. The thing is, when you’re made of a bush that’s growing all the time, you need a lot of “haircuts” to stay nice and neat — far more than your smoother, slimier friends.

*Wee ones:* This frog is 1 of 3 frogs sitting at that pool. How many other frogs hang out with him?

*Little kids:* If the frog needs a quick trimming every other day and he got a haircut Sunday and Tuesday, when is his next haircut? *Bonus:* If it takes 6 minutes to trim his back, 5 minutes to clean up his tummy and 2 minutes to trim his toes, how long does the frog’s haircut take?

*Big kids:* If a regular pet frog is 5 inches tall and this frog is 7 times as tall, how tall is the topiary frog? *Bonus:* If you have to trim the frog every 3^{rd} day starting on March 3, and the grand piano every 5^{th} day, how many times in March will they both get a haircut?

__Answers:__

*Wee ones:* 2 more frogs.

*Little kids:* Thursday. *Bonus:* 13 minutes.

*Big kids:* 35 inches tall. *Bonus:* Twice: on March 15 and March 30, since both those numbers are multiples of both 3 and 5.

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]]>The post As Schlumpy As a Sloth appeared first on Bedtime Math.

]]>Just about every crazy animal gets its own holiday, and today we celebrate International Sloth Day. A sloth looks like a walking shag carpet with a face. It’s famous for being the slowest, laziest mammal out there. Sloths sleep 20 hours a day, and can’t move any faster than 6-7 miles an hour — only a little faster than we people walk. They sit still for so long that tiny green plants called algae grow in their fur! Extra toes don’t help, either: the 3-toed sloth actually moves *more* slowly than the 2-toed sloth. While adult sloths look green, hairy and gross (like the one in the picture here), baby sloths are almost cute, as shown in the top picture. It’s too bad they’ll grow up to be as slow as their parents.

*Wee ones:* Who has the most toes on 1 foot: a 2-toed sloth, a 3-toed sloth, or you? Count your toes to find out!

*Little kids:* Sloths hang from trees by their 4 arms. How many more arms than you does a sloth have? *Bonus:* A day has 24 hours. After sleeping 20 hours, how many hours that day does the sloth stay awake?

*Big kids:* If sloths have either 2 toes on every foot or 3 toes on every foot (with 4 feet in total), how many sloths could be in the room if they have 32 toes in total? *Bonus:* Is it possible for a group of sloths to have 30 toes in total?

*The sky’s the limit:* If a sloth hustles along at 6 miles an hour, and you can run at 10 miles an hour, how much faster than the sloth can you cross a 30-mile forest?

__Answers:__

*Wee ones:* You have the most toes, since you have 5!

*Little kids:* 2 more arms. *Bonus:* 4 hours.

*Big kids:* There could be four 2-toed sloths (8 toes each), or one 2-toed sloth and two 3-toed sloths (12 toes each). *Bonus:* No, because the total number of toes is always a multiple of 4, and 30 isn’t divisible by 4.

*The sky’s the limit:* 2 hours faster. The sloth will need 5 hours to “run” the 5 6-mile chunks, while you’ll need only 3 hours.

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]]>The post It Smells Like 3 O’Clock appeared first on Bedtime Math.

]]>It’s a good thing our noses aren’t like dog noses. Dogs’ noses are so wet and slobbery. But our furry friends can smell so much more than we can. Scientists have learned that dogs can pick up scents from 40 feet underground — more than the height of a house! Dogs can also tell how old a smell is, and can sense when the smell in a room starts changing. Why do their noses work so much better than ours? It all comes down to the numbers: our noses have about 5 million “receptors” (tiny body parts that sense smells), while dog noses have 125 to 130 million! Also, dogs breathe air back out through the sides of their noses instead of their nostrils; that way the smell inside their nose doesn’t blow away, and they can learn it better.

*Wee ones:* If you, your friend and your dog go for a walk, how may noses do you have all together?

*Little kids:* If a dog can smell down to 40 feet below ground, and you’re in a tunnel 30 feet below ground, can the dog smell you? *Bonus:* How many more feet down could you dig and still be smellable by that dog?

*Big kids:* If there are 4 noses in the room, but twice as many dog legs as people legs, how many dogs and people are in the room? *Bonus:* If you have 5 million scent receptors in your nose, and a puppy has 60 million, how many times as many does the puppy have compared to you?

__Answers:__

*Wee ones:* 3 noses.

*Little kids:* Yes! You’re less than 40 feet below. *Bonus:* 10 more feet.

*Big kids:* 2 dogs, 2 people. A dog by itself has twice as many legs as a person, so there are equal numbers of dogs and people. So we split 4 in half. *Bonus:* 12 times as many.

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]]>The post Stairway to the Moon appeared first on Bedtime Math.

]]>Our Moon is bigger than you think. It may look small, but it’s about 2,000 miles across, the same width as the US from Florida to California! The Moon looks teeny only because it’s a quarter million miles away. So our fan Quinn F. asked, how many stairs would you need to walk to the Moon? Well, you’re climbing 240,000 miles, which is more than 1 billion feet (1,267,200,000 feet), or about 15 billion inches. House stairs are supposed to be 7 3/4 inches tall at most. So you need 1,962,116,129 steps — almost 2 billion stairs to climb that high! The problem is, stairs are also 10 inches from front to back. So those stairs would start 310,000 miles way over to the side. You’d have to fly into outer space just to start climbing!

*Wee ones:* Look out the window. Do you see any space objects right now, like the Moon, Sun, or stars? What shapes do you see?

*Little kids:* If you climb steps 2 at a time, after the 2^{nd}, 4^{th} and 6^{th} which step do you touch next? *Bonus:* Once you’ve jumped to the 10^{th} step, how many have you touched in total?

*Big kids:* Can you “spell” 2 billion as a number, without looking at the numbers above? *Bonus:* If you can climb 100 steps in a minute, how many minutes would it take to climb the 2 billion steps to the Moon?

*The sky’s the limit (for real):* While the Moon is 1/4 million miles away, the Sun is 93 million miles away. If you need 2 billion steps to reach the Moon, how many do you need to reach the Sun? (Hint if needed: How many do you need to climb 1 million miles?)

__Answers:__

*Wee ones:* The Sun always looks like a circle; the Moon can be a circle, a gibbous shape (circle with one edge shaved off), a half circle, or a crescent (C shape); stars look like tiny circles.

*Little kids:* The 8^{th} step. *Bonus:* 5 steps.

*Big kids:* 2,000,000,000. *Bonus:* 20 million minutes, which is 13,889 days, or 38 years!

*The sky’s the limit (for real):* 744 billion steps. You need 8 billion steps for each million miles, then need 93 times that number to reach the Sun.

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]]>The post Growing the Great Pumpkin appeared first on Bedtime Math.

]]>With Halloween coming soon, people are gathering pumpkins to carve, paint, or bake into pies. And as shared by our fan Lillian I., for some people no pumpkin is too big. In this video, pumpkin ninja Ron Wallace tells us how he grows his giant pumpkins. In 2009 he was the first grower ever to grow a 2,000-pound pumpkin. Then last year, the 2,230-pounder he grew broke the North American record for the heaviest pumpkin ever – it weighed as much as a small car! Ron works hard to grow these crazy squashes. He replants seeds from other giant pumpkins, spends hours watering and trimming, and chases away mice and bugs. Big pumpkins taste really gross and can’t be baked into pie, but people pay $1,000 just to buy a seed from his farm!

*Wee ones:* Ron has grown 18-foot tall sunflowers. That’s as tall as a stack of 3 grown-ups! Look at a grown-up, and imagine stacking 2 more grown-ups that size on top of his/her head.

*Little kids:* Pumpkins are round. Can you name 3 shapes that are round? *Bonus:* If Ron plants seeds in May and picks the pumpkins 5 months later, in what month does he pick them?

*Big kids:* If you have $800, how much more money do you need to buy a $1,000 magic pumpkin seed from Ron? *Bonus:* If every pound of pumpkin can make 2 pies, how many yucky-tasting pies could be baked from Ron’s 2,230-pound pumpkin?

__Answers:__

*Wee ones:* Picture 3 grown-ups standing on each other’s heads!

*Little kids:* Answers might include a circle, oval, “sphere” (ball) and “torus” (donut). *Bonus:* In October.

*Big kids:* $200 more. *Bonus:* 4,460 pies!

The post Growing the Great Pumpkin appeared first on Bedtime Math.

]]>The post Life-Size Candy Land appeared first on Bedtime Math.

]]>In Candy Land, anyone can win at any time. As you move your little person through the path, you might* **think* you’re about to win as you get near the end. But if you draw a card for a candy near the beginning, suddenly you’re sent all the way back. What if you got to walk up and down a real, life-sized path like that? Some people actually did! When the game Candy Land turned 60 years old in 2009, people made a giant Candy Land board on San Francisco’s Lombard Street, also known as “the crooked street.” Groups of kids dressed in their team’s colors ran down the street when it was their move. We hope they ate some giant candy along the way, too.

*Wee ones:* If the squares in Candy Land are red, purple, yellow, blue, orange, and green, how many colors do they use?

*Little kids:* If you move 2 squares ahead on your first turn, then 5 squares ahead on your next, how many squares do you move in total? *Bonus:* If 3 teams of 10 kids play on this giant board, how would you count up those kids by 10s?

*Big kids:* If Candy Land was 60 years old in August 2009, how old is Candy Land today in 2016? *Bonus:* If the section of street used was 600 feet long and each square was 20 feet long, how many squares long was the path? (Hint: To divide by 20, you’re dividing by 2, then by 10).

*The sky’s the limit:* The colored squares in Candy Land are in the order red, purple, yellow, blue, orange, green (6 colors). If the board starts on red and repeats this order, what color is the 59th square? (Assume there are no candy spaces in the way.) What do you think could be the fastest way to figure this out?

__Answers:__

*Wee ones:* 6 colors.

*Little kids:* 7 squares. *Bonus:* 10, 20, 30.

*Big kids:* 67 years old. *Bonus:* 30 squares.

*The sky’s the limit:* The 59th square is orange, because 60 is a full set of 6, and therefore the 60^{th }square, which follows the 59^{th}, is green.

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]]>The post The Wild Side of Watermelon appeared first on Bedtime Math.

]]>When food shows up in a crazy shape, will it still taste good? You might worry a little when someone hands you a square watermelon. Someone figured out that if you build a plastic box around a growing watermelon, it will grow to fill the corners, and turn into a box shape itself. While these cubic fruits look fun, the price isn’t: 1 cube watermelon can sell for more than $75! Luckily you can grow your own (find out here how to do it). One good thing about this shape is that you can grow 4 times as many cube watermelons as round watermelons inside the same garden space. If they even taste good, that’s a great deal.

*Wee ones:* These cube watermelons are shaped like boxes. See if you can spot a box or box shape in your room.

*Little kids:* How many “faces” (flat sides) does a cube watermelon or any box shape have? *Bonus: *How many corners (pointy parts where 3 faces meet) does a cube watermelon have? See if you can find and count them all!

*Big kids:* You can fit 4 times as many cube watermelons as round watermelons in the same garden space. If you can grow 5 round watermelons in your garden, how many cube watermelons could you plant instead? *Bonus:* If you put 12 cube watermelons in 3 rows of 4 to make a rectangle, how many watermelons are in the middle/not on the edge?

__Answers:__

*Wee ones:* Answers might include shoeboxes, or box shapes like building blocks or Lego pieces.

*Little kids:* 6 faces. *Bonus:* 8 corners.

*Big kids:* 20 cube watermelons. *Bonus:* The 2 melons in the middle.

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]]>The post Big Foot – for Real appeared first on Bedtime Math.

]]>That pair of feet looks HUGE, doesn’t it? It’s not just because the person taking the picture snuck up close. Jeison Hernandez has the world’s biggest feet. At almost 16 inches long, they’re longer than a real 12-inch “foot”! Of course, taller people have longer feet, and Jeison himself stands over 7 feet tall. Even so, his size 26 feet still shock and amaze everyone who sees them. In the whole history of the world, the biggest feet ever were bigger than that. Back in the 1930s, the world’s tallest man, Robert Wadlow, had feet 18 1/2 inches long, and wore a size 37AA shoe. All we can say is, don’t try to play soccer against these guys.

*Wee ones:* Stand next to a grown-up so your feet are side by side. Whose feet are longer?

*Little kids:* Hold your right foot against your left forearm (the part from your elbow to your wrist). Which one is longer? *Bonus:* How much taller would you need to grow to stand 7 feet tall like Jeison? Find out your height rounded to the closest foot!

*Big kids:* If Jason wears a size 26 shoe, how many sizes bigger were Robert’s size 37 feet? *Bonus:*For grown-ups, a jump of 3 shoe sizes equals 1 inch in shoe length. If Jason is size 26 and your feet were 6 inches shorter, what shoe size would you wear?

__Answers:__

*Wee ones:* The grown-up’s feet are probably longer!

*Little kids:* Cool fact: on most people, the foot and forearm are close to or exactly the same length! *Bonus:* Different for everyone…find out your height in feet, then subtract from 7.

*Big kids:* 11 sizes bigger. *Bonus:* Size 8, since your feet would be 18 shoe sizes shorter.

The post Big Foot – for Real appeared first on Bedtime Math.

]]>The post Pancakes for Your Pets appeared first on Bedtime Math.

]]>We people love pancakes. It turns out some tortoises do, too. They’re the round-shelled reptile stars of this video. While turtles live in water, their cousin the tortoise likes to eat grass, fruits and veggies. But when handed a stack of tiny little pancakes, these tortoises see that maybe life has yummier food choices. The big tortoise dives right in and munches away, but the little tortoise — who is shorter than his stack of pancakes — isn’t so sure. How would you feel if you were served a stack of pancakes that’s taller than you? Actually, you might dive right in, too.

*Wee ones:* What shape do you think these tiny tortoise pancakes are?

*Little kids:* If the big tortoise has 3 pancakes and the teeny tortoise has 3 of his own, how many do they have together? *Bonus:* If the big guy eats all 3 pancakes and the little tortoise ends up eating 1, how many pancakes are left for you?

*Big kids:* If you can stack 10 people pancakes in a foot, how many pancakes would make a stack as tall as you? You can round your height to the nearest foot or half-foot for this one! *Bonus:* If you’re handed a stack of 60 pancakes and are hungry enough for only 1/4 of them, how many do you eat?

*The sky’s the limit:* If a group of 4 big tortoises and 2 tiny tortoises eats 30 pancakes in total, and each big tortoise eats twice as many as each tiny tortoise, how much does each size tortoise eat?

__Answers:__

*Wee ones:* A circle. Their 3D shape is actually a very short, wide cylinder.

*Little kids:* 6 pancakes. *Bonus:* 2 pancakes.

*Big kids:* Different for everyone…round off your height, and add up 10 for every foot of height and another 5 pancakes for a half-foot. *Bonus:* 15 of them.

*The sky’s the limit:* Each tiny tortoise eats 3 pancakes, and each big tortoise eats 6 pancakes. Since each big tortoise eats double a tiny tortoise, together 2 big tortoises eat 4 times as much as each tiny tortoise, and thus, 4 big ones together also eat 4 times as much as 2 tiny tortoises. That means the tiny tortoises’ set plus 4 more of these sets makes 5 sets of pancakes, which means the pair of tinies eats 6 pancakes. So each tiny tortoise eats 3, and each big one eats double that, which is 6 apiece.

The post Pancakes for Your Pets appeared first on Bedtime Math.

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