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.

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]]>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.

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]]>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!

Answers:

*Wee ones:* 3 jumps.

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]]>The post That Dress Is Trash! appeared first on Bedtime Math.

]]>It’s good to recycle your trash instead of throwing it out. But it’s even better if you can just wear it. Every spring, lots of big kids go to special dances called proms, and need to wear special clothes. So a few kids have decided to wear trash. Maura Pozek made her dress from Dorito bags. Another girl, Regan Kerr, made her dress using 5,000 pop tabs from soda cans. It took her 5 months to make it, but hopefully she didn’t drink all that soda herself!

*Wee ones:* Dorito bags are rectangle-shaped: they have 4 sides. Find 3 rectangle shapes in your room.

*Little kids:* If you use 20 blue Dorito bags and 30 orange Dorito bags, of which color do you have more? *Bonus:* How many more? You can count up to find out!

*Big kids:* If Regan started her 5-month dress project in the middle of November, would she have finished by mid-May? *Bonus:* If Regan and 9 friends drank those 5,000 cans of soda, and split them equally, how many cans did each person drink?

*The sky’s the limit:* If Regan started drinking 50 cans of soda per week 1 year earlier, would she have built up 5,000 pop tabs in time for prom?

Answers:

*Wee ones:* Items might include books, doors, windows, and blankets.

*Little kids:* More orange bags. *Bonus:* 10 more orange bags.

*Big kids:* Yes. She would have finished in April. *Bonus:* 500 cans.

*The sky’s the limit:* Not quite. There are 52 weeks in a year, so she would have drunk only 2,600 cans. She’d need to drink about twice as many!

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]]>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.

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]]>The post How to Make More S’mores appeared first on Bedtime Math.

]]>S’mores bring together two really yummy treats: chocolate and marshmallow. You roast a marshmallow on a stick over a campfire, then smush it with a square of chocolate between two graham crackers. The hot marshmallow melts the chocolate into a gooey, tasty mess. Well, two ladies at Gooseberry Patch show us how to bake a whole tray of S’mores at once. You layer chocolate squares and mini-marshmallows on top of graham crackers, then bake the whole thing at 400 degrees. It makes 16 melted S’mores just like “real” ones, and without any leaves or dirt mixed in!

*Wee ones:* If S’mores use graham cracker, chocolate, and marshmallow, how many ingredients do they use?

*Little kids: *If your S’more uses 2 crackers, 3 squares of oozing chocolate, and 2 gooey mini marshmallows, how many pieces do you use? Bonus: If you make a super tall S’more that layers cracker, chocolate, marshmallow, then cracker again to repeat…what’s the 12th layer?

*Big kids:* If your tray holds 4 rows of 6 crackers each, how many S’mores can you make at once? *Bonus:* If each S’more uses 3 chocolate rectangles and you have 7 bars of 8 rectangles each, do you have enough rectangles to make 20 S’mores?

*The sky’s the limit:* To find out if a number is a multiple of 7, you chop off the last digit, double it, then subtract that from what’s left of the number. If you get a multiple of 7 (including zero and negative multiples of 7) as your answer, then the starting number is a multiple. If each S’more uses 7 mini marshmallows and you have a bag of 196 minis, will you have any leftover minis as you make your S’mores?

Answers:

*Wee ones:* 3 ingredients.

*Little kids:* 7 pieces. *Bonus:* Marshmallow, just like every 3rd layer.

Big kids: 24 s’mores. *Bonus:* Not quite. You’ll need 60 pieces, and the bars give you only 56.

*The sky’s the limit:* No leftovers — 196 is a multiple of 7! To test 196, you chop off the 6 to leave you with 19. Then subtract 6 x 2 (which is 12) from that 19. This gives you 7, so 196 will let you make an exact numbers of S’mores.

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]]>The post Your Own Backyard Waterslide appeared first on Bedtime Math.

]]>Amusement parks have the biggest, fastest water slides rides you’ll ever ride — unless you build one the same size in your backyard! Grandpa Paul Betts saw an amusement park in England throwing out an old waterslide. He bought all the giant tube pieces from them for just 50 pounds (about $65 at the time of writing), then brought them to his grandkids’ house. With 18 sections each almost 10 feet long, the slide stretches 130 feet across the land, even with all the twists and turns. That’s the length of several houses! They can slide on it dry, but in the summer they run water through it and put a splashy pool at the bottom for the landing — because by the end they’re sliding pretty fast.

*Wee ones:* What shape is the opening of the waterslide tube?

*Little kids:* If the grandpa, the mom, the dad, and the 2 kids all ride the waterslide, how many people get to ride it? *Bonus:* If they start off connecting just 3 10-foot pieces, how long a slide do they make? Count up by 10s!

*Big kids:* If the grandpa, mom, and her son Oscar line up to take turns, how many different ways can they line up? *Bonus:* If a normal slide is 6 feet long, and this one has 18 10-foot sections, how many times as long as a normal slide is this crazy slide?

Answers:

*Wee ones:* An oval, or it might be a perfect circle when not squished.

*Little kids:* 5 people. *Bonus:* 30 feet: 10, 20, 30.

*Big kids:* 6 ways: GMO, GOM, MGO, MOG, OGM, OMG! (There are 3 choices for the 1st rider, then for each of those there are 2 choices for the 2nd, and the 3rd is set, giving us 3x2x1). *Bonus:* 30 times as long! 18 1-foot sections would be 3 times as long in total, so making them 10 feet multiplies that by 10.

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]]>The post A Ride with Mama Turtle appeared first on Bedtime Math.

]]>It’s Mother’s Day, the day we celebrate everything our moms do for us. But why not celebrate all moms, not just humans? Animal moms work just as hard to care for their kids. Look at this huge African tortoise mama carrying her babies. The African tortoise is the largest tortoise in Africa, with the grown-ups weighing nearly 180 pounds. Her 4-day-old babies, though, are only 2-3 inches long, and weigh only about 1 ounce (1/16th of pound). They’ll have to grow a lot before they can carry their own kids!

*Wee ones:* The African tortoise is the 3rd largest type of tortoise in the world. How many kinds of tortoises are bigger?

*Little kids:* If the 3rd tortoise slides off the shell, then the 4th tortoise, then the 5th…who’s next? *Bonus: *If the next 2 babies stay on, who slides off after them?

*Big kids:* If the mom and her 1-pound baby weigh 160 pounds together, how much does the mama weigh? *Bonus:* Once each baby weighs 1 1/2 pounds, how much do 2 of them weigh together?

*The sky’s the limit:* If 8 baby tortoises sit in a circle, and the mama kisses every 3rd one — the 1st, then the 4th, then the 7th, then looping back around to the 2nd, and so on…how many times does she have to go around to kiss all 8?

Answers:

*Wee ones:* 2 types of tortoises.

*Little kids:* The 6th tortoise. *Bonus:* The 9th tortoise.

*Big kids:* 159 pounds. *Bonus:* 3 pounds.

*The sky’s the limit:* 3 times around, since she’s kissing about 1/3 of them each time. She’ll kiss the 1st, 4th and 7th baby, then the 2nd, 5th and 8th, then the 3rd and 6th.

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]]>The post How to Catch a Flying Grape appeared first on Bedtime Math.

]]>We’re not supposed to toss our food and catch it in our mouths, but some people just can’t stop themselves. And grapes are their favorite choice of food. Paul Tavilla says he’s caught a grape from the farthest distance, 327 1/2 feet away. Steve Spalding caught 116 grapes in 3 minutes, as shown in this video. But the only official Guinness world record holder is AJ Henderson, who in 2013 threw a grape 69 1/2 feet high and caught it in his own mouth. If you want to get great at catching grapes, take Paul’s advice: use black grapes because they’re easy to see, and keep your eyes open.

*Wee ones:* If your friend catches 4 grapes in a row and you catch 6 in a row, who caught more?

*Little kids:* If you catch the 1st grape you throw, then the 3rd, then the 5th, what grape do you catch next? *Bonus:* If you can catch 10 grapes per minute, how would you count them up over 4 minutes? Count up by 10s!

*Big kids:* If Steve had caught exactly 1,200 grapes in 1/2 hour, how many would he have caught in 1 hour? *Bonus:* How many did he catch per minute? (Reminder: A whole hour has 60 minutes.)

Answers:

*Wee ones:* You caught more!

*Little kids:* The 7th grape. *Bonus:* 10, 20, 30, 40.

*Big kids:* 2,400 grapes in an hour. *Bonus:* 40 grapes per minute, since a 1/2 hour has 30 minutes and 1200/30 = 40.

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]]>The post Your Body Rocks! appeared first on Bedtime Math.

]]>Your body is an amazing machine that does far more than you realize. As this webpage sent by our fan Josh W. shows, your lungs, heart, muscles, teeth, and other parts all do a ton of work:

– Your heart beats about 100,000 times a day, and you don’t even think about it.

– You also don’t think about the 17,000 breaths you take.

– About 50,000 thoughts pass through your brain in a day, maybe even 60,000.

– Your body makes enough heat to run 25 light bulbs all day.

– Each blood cell makes 1,440 trips around your body in a day. That’s why those cells live only about 40 days, after making 60,000 trips.

And there’s more. If you feel tired just from reading this, think how your heart, brain and liver feel!

*Wee ones:* Your eyes blink almost 30,000 times a day! Try to blink just your left eye, then just your right eye.

*Little kids:* Take 10 deep in and out breaths, counting them from 10 down to 1. *Bonus:* If you had taken 14 breaths instead, how many more breaths would that be?

*Big kids:* If cells last 40 days, with May 11 counting as their whole first day, which day is their last? (Reminder: May has 31 days.) *Bonus:* If you thought 2,000 thoughts each hour, would that rack up to 50,000 thoughts in a 24-hour day?

Answers:

*Wee ones:* Try winking with just one eye – and see if you know your left from right!

*Little kids:* 10, 9, 8, 7, 6, 5 ,4 ,3, 2, 1. *Bonus:* 4 more breaths.

*Big kids:* June 19. May 31 is their 21st day of life, so they live another 19 days in June. *Bonus:* Not quite — it would come to 48,000. So we think more than that!

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