The post Sneaky Fun for Fawns appeared first on Bedtime Math.

]]>Deer aren’t among the best-swimming animals, but that’s not stopping this one. A family in Freehold, NJ found a baby deer, or fawn, swimming in their backyard pool one hot day in June. As you can see in the video, the deer swims laps as if this is her pool! She came back the next day, and the next…the only day she skipped was the rainy one. The fawn used the pool as a way to cool off. The pool looks like a pond since its walls are painted a darker blue than most pools, and the water has salt, not chlorine. So if this fawn wants to train for the Olympics, she’s found her practice spot.

*Wee ones:* Deer have 4 legs. Stand with another person front to back to “be” a deer. Now walk like one: step with your left foot while the other person steps right, then switch feet!

*Little kids:* If the fawn swims 1 lap around the pool, then 2 more laps, then 3 more laps, how many laps has she swum? *Bonus:* If she wants to swim 10 laps total and is counting down, what number does she say for the next lap?

*Big kids:* If the fawn swims on a 75-degree day to cool off, then on a 93-degree day, and the 3^{rd}day’s temperature is halfway between those, how hot is the 3^{rd} day? *Bonus:* If there are 100 deer legs in the pool, how many deer friends did the fawn bring along?

*The sky’s the limit:* If the deer swims 1 lap the first day, 2 laps the next, 3 the next…on what day will she have swum 36 laps? Can you find a pattern to solve it without adding all the numbers?

Answers:

*Wee ones:* See if you can step with the correct foot!

*Little kids:* 6 laps. *Bonus:* 4, since she’s counted down, 10, 9, 8, 7, 6, 5.

*Big kids:* 84 degrees. The temperatures are 18 degrees apart, so the halfway mark is 9 degrees from either of them. *Bonus:* 24 deer, since there need to be 25 in total.

*The sky’s the limit:* On day 8. She swims 1 lap, then 3 total by the end of day 2, then 6 total, then 10…these are the “triangle numbers.” Each one is the day’s number times 1 more than that number, then cut in half. 36 is half of 72, which is 8 x 9, so it’s on day 8.

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]]>The post Toy Tiger on a Trip appeared first on Bedtime Math.

]]>Do you have a favorite stuffed animal? One little boy named Owen loves his stuffed tiger, Hobbes. But on a trip to Houston, Texas, Owen left Hobbes behind in the Tampa Bay airport by accident. He was so upset when he realized he’d lost him. Luckily, an airport worker found Hobbes — and then, while they waited for Owen to fly back home to Tampa, he took Hobbes on his own adventure around the airport. He showed him the traffic control tower, an ice cream shop, the airport gym, and even the Marriott hotel pool. He took photos of Hobbes in each spot, and glued the pictures together to make a book. When Owen flew back to Florida, he found Hobbes and his photo book waiting in the Lost and Found! Now Owen and Hobbes are happily together again, and ready for their next adventure.

*Wee ones:* If Hobbes visited the traffic control tower, the ice cream shop, the gym and the pool, how many places did Hobbes visit?

*Little kids:* If Hobbes took 2 photos in each of those 4 spots, how many photos did the book have? Count up by 2s! *Bonus:* If Owen flew out midday Friday and came back to Tampa midday on the next Tuesday, how many days later was that?

*Big kids:* If Hobbes spent 10 minutes at the gym, twice as long eating ice cream, and 10 minutes longer riding a luggage cart than he spent eating, how long did those adventures take all together? *Bonus:* What fraction of that time did he spend riding the cart?

Answers:

*Wee ones:* 4 places.

*Little kids:* 8 photos. *Bonus:* 4 days.

*Big kids:* 1 hour (60 minutes), since it took 10+20+30. *Bonus:* 1/2 the time, since it took 30 of the 60 minutes.

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]]>The post Take Your Dog to Work Day appeared first on Bedtime Math.

]]>Every day we see grown-ups go to their jobs and work hard — maybe at an office, a restaurant, a school, or a construction site. Well, today their dogs get to help out. It’s Take Your Dog to Work Day, and we’re wondering how well that’s going to go. Sure, dogs are friendly and helpful, and if they could type, use scissors, or drive a dump truck, they’d happily do it for us. But we’re guessing that most visiting dogs are better at sniffing people’s feet and chewing the furniture. If dogs did have to work, the workplace would need taller chairs, dog food at the cafeteria, keyboards with really huge letters…and a boss who understands their barks. Plus what if a dog up on the 30th floor needs to pee? It’s probably just as well they go to work just one day of the year.

*Wee ones:* Dogs have 4 legs. Get down on your hands and knees like a dog, and bark 6 times!

*Little kids:* If today is Friday and your dog also went to work yesterday, what day was that? *Bonus:* If you and your dog take turns typing, and you type the 1st sentence, then your dog types the 2nd, then you type the 3rd and so on…who types the 12th sentence?

*Big kids:* If you work as a chef and your dog eats every 4th burger you flip, how many does she eat out of 12 burgers you cook? *Bonus:* If a dog has 2 people working for him, and they each have 3 people working for them, and *those* people each bring 4 dogs, how many dogs work with that top dog?

Answers:

*Wee ones:* Count your barks: 1, 2, 3, 4, 5, 6!

*Little kids:* Thursday. *Bonus:* Your dog.

*Big kids:* 3 burgers, whether she starts on the 1st or some other burger. *Bonus:* 24 dogs, brought by 6 people (3+3).

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]]>The post Better Than the Video Game appeared first on Bedtime Math.

]]>Usually when people love a video game, they just play it all the time. But then there’s Kjetil Nordin, who instead knitted a giant blanket picturing the game Super Mario 3. The blanket, which is 7 feet by nearly 6 feet long, took him 800 hours to crochet spread out over 6 years! He made each stitch of the blanket match each colored dot on the computer screen. We see the full scoreboard, trees, and a castle with the word “HELP” yelled out the window. During those 6 years, Kjetil also graduated from college with two degrees and won the Norwegian Sky Diving team championship twice. Kjetil may love Super Mario, but he’s not wasting much time playing it.

*Wee ones:* If the scoreboard has white, black, blue, yellow and red, how many colors of yarn does it use?

*Little kids:* If the water around the castle is 11 stitches wide, what numbers would you say to count them? *Bonus:* If the last 3 stitches are dark blue, what number is the 1st dark blue stitch?

*Big kids:* The castle looks about 20 stitches wide by 20 stitches tall. How many stitches does that little castle have? *Bonus:* If Kjetil had crocheted a whole 10 hours a day every day, in about how many weeks could he have finished?

*The sky’s the limit:* If there are 50 stitches per 1 foot length of blanket (and 50 rows per foot as well), and the whole piece is 7 feet long by 6 feet wide, how many stitches does this crazy blanket have? How would you try to multiply that out?

Answers:

*Wee ones:* 5 colors of yarn.

*Little kids:* 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11. *Bonus:* 9. Remember, if 3 are dark blue, then there are 11-3 or 8 stitches that are NOT dark blue, so it can’t be 8 (this is the “fencepost problem”). Count down from 11 to prove it!

*Big kids:* About 400 stitches. *Bonus:* Just over 11 weeks. He would have taken 80 days, and 77 days fill 11 weeks.

*The sky’s the limit:* 105,000 stitches. There are 2,500 in each square foot (50 rows with 50 stitches in each), which means every 4 square feet have 10,000 stitches. There are 42 square feet in total (7 x 6). So the 40 square feet have 100,000 stitches, and the last 2 square feet add another 2,500+2,500, or 5,000.

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]]>The post Longest Day of the Year appeared first on Bedtime Math.

]]>Today is the first day of summer! at least for the northern half of our planet. It’s also called the “summer solstice,” and it’s a special day in space: Today the top half of Earth is tilted toward the sun the most it ever is in a year. That gives us the longest day of the year, because the northern half is in the sunshine for longer. The farther north you go, the earlier your sunrise, the later your sunset, and the longer your day – in fact, the North Pole will have no nighttime for weeks! To see how this works, shine a flashlight at a ball that’s tilted as you turn it. Meanwhile, the southern half of our planet is starting WINTER. It’s the shortest day, with the longest shadows and total darkness at the South Pole. And in December, we’ll all switch!

*Wee ones:* Turn on a light, and hold a pencil standing straight up from the table. How long is the shadow? How does that change if you put the pencil on the floor or another surface, using the same light?

*Little kids:* If the sun rose today at 5:00 am for your grandparents and 1 hour later for you, at what time was sunrise for you? *Bonus:* If a town near the North Pole has just 1 hour of dark tonight, how many hours of daylight do they have today? (*Reminder:* A day has 24 hours.)

*Big kids:* Today in Alaska the sun rose around 4:30 am, and won’t set until around 11:30 tonight! How many hours of daylight do they have today? *Bonus:* If you stood outside today at solar noon (1:00 daylight savings), your shadow was the shortest of any time of year! If it was 25 inches long today and it’s 3 times as long at noon on the winter solstice (lowest sun of the year), how long is your winter shadow?

Answers:

*Wee ones:* See how the shadow changes with light at different angles!

*Little kids:* 6:00 am. *Bonus:* 23 hours of light.

*Big kids:* 19 hours of daylight, since it’s 12 hours from 4:30 am to 4:30 pm, then another 7 hours. *Bonus:* 75 inches.

And to find out the sunrise and sunset times for your town on any day of the year, check out http://www.sunrisesunset.com/USA/!

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]]>The post Waterslide for Ducks appeared first on Bedtime Math.

]]>Everyone loves a great waterslide: it’s fun to swoosh down and make a giant splash at the bottom. But why should we humans have all the fun? Ducks love water — and it turns out they love water slides, too. At the South Carolina State Fair, someone set up a waterslide and let 6 baby ducks play on it. Ducks are great swimmers, thanks to waterproof feathers, lots of body fat that helps them float, and webbed feet that paddle fast. But as we see in this video, they’re happy with 1-inch-deep water, too. It looks like there are snacks at the top of the ramp as a bonus treat. If only we humans could have one of these in our living room…

*Wee ones:* Who has more feet, you or a duck?

*Little kids:* There are 6 ducklings waddling around on the waterslide. If one’s on the slide and one’s waddling up the ramp, how many are left snacking ? *Bonus:* How many of those webbed feet do the 6 ducklings have altogether? Count up by 2s if you want!

*Big kids: *If each of the 6 ducklings takes 4 turns, how many duck-slidings happen in total?* Bonus:* The video lasts about 30 seconds, and the 6 ducklings each slide once. If they took their turns evenly spaced, with one starting right at 0 seconds and the last one at 30 seconds, how many seconds apart did they start their turns?

*The sky’s the limit:* If these 6 ducklings are named Quinn, Quan, Quickie, Quackie, Queenie and Quipper, how many ways can they line up so that Quinn always slides first?

Answers:

*Wee ones:* Both people and ducks have 2 feet, so you have the same number!

*Little kids:* 4 ducklings. *Bonus:* 12 feet.

*Big kids:* 24 slidings. *Bonus:* 6 seconds, because after the 1st duck the remaining 5 ducks split the time into 5 equal chunks. This “do you count the start?” issue is called the “fencepost problem.”

*The sky’s the limit:* 120 ways. If Quinn always slides first, then only 5 ducks have to rotate their line-up. You have 5 choices for the 2nd duck, then once he/she is chosen, for each of those 2nd-sliders you have 4 choices for the 3rd duck, giving you 5 x 4 combinations. Then for each of THOSE combos, there 3 choices for the next slot, and so on, giving you 5 x 4 x 3 x 2 x 1 = 120 possible line-ups.

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]]>The post When You’re Way Bigger Than Your Bike appeared first on Bedtime Math.

]]>What the heck is this guy doing? He’s riding the world’s smallest bike. Usually when people break bike-riding records, it’s for riding really fast or really far. But not this bike! Most bikes are 4-5 feet long, while this bike is only about 12 inches long. The 2-inch wheels are almost as thick as they are wide, otherwise the rider would tip over. As we see in the video, the man really does turn the teeny pedals with his feet to ride. It looks silly, and it’ll take him a long time to get anywhere, but it still counts as a bike ride.

*Wee ones:* What shape is a bike wheel? Can you find that shape in your room?

*Little kids:* If a regular bike is 5 feet long and this one is only 1 foot long, how much longer is a regular bike? *Bonus:* If the bike can hold up to 200 pounds without breaking, can you piggyback on a 100-pound person to ride it?

*Big kids:* If you can ride to school in 10 minutes on a regular bike, but it takes 10 times as long on the teeny bike, how long does your ride take now — in hours and minutes? *Bonus:* In the world’s highest bunny hop on a bike, Rick Koekoek popped up 4 feet 8 inches. If the world’s teeniest bike can hop only 1/4 as high, how high can it hop?

Answers:

*Wee ones:* A circle, or in 3D, a “torus.” Circles in your room might include buttons or clock faces.

*Little kids:* 4 feet longer. *Bonus:* Different for everyone: if you weigh 100 pounds or less, then yes!

*Big kids:* 100 minutes, which is 1 hour 40 minutes. *Bonus:* 1 foot 2 inches, or 14 inches.

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]]>The post The World’s Best Father – On Camera appeared first on Bedtime Math.

]]>Today is Father’s Day, the day we honor our dads for all the great things they do. But dads aren’t always sure that they’re doing a good job. So one dad, Dave Engledow, decided to show the worst possible fathering in a series of pictures. He posed his baby girl Alice with sharp objects, hot ovens, dangerous electrical equipment — and always with Dave’s “World’s Greatest Father” coffee cup in the picture. Now, Alice didn’t REALLY hold marshmallows over a fire or play with toys in the toilet; her dad used the computer to make the photos look that way. But Alice does look like she’s having fun.

*Wee ones:* If Alice is roasting 4 marshmallows, what numbers would you say to count them?

*Little kids:* If the photo shows 5 pancakes in the air, 1 on the hot griddle and 1 on Alice’s spatula, how many pancakes are on their way to Dave? *Bonus:* If there are another 6 pancakes on Dave’s plate, how many are there in total?

*Big kids:* If Dave photographed Alice for 45 minutes in the bathroom, then spent 45 more minutes on the computer to “put” toys in the toilet bowl, how long did that photo take? *Bonus:* If the photo with Alice on the car roof took Dave 240 minutes total, and the computer work took twice as long as the actual picture-taking on the car, for how long did Alice sit on the car?

*The sky’s the limit:* Dad Dave had to snap a lot of pictures, and use up a lot of food. If he took 5 pictures and burned 50 marshmallows total, and used 1 more marshmallow on each photo than the one before, how many marshmallows did he burn on the 4th photo?

Answers:

*Wee ones:* 1, 2, 3, 4.

*Little kids:* 7 pancakes. *Bonus:* 13 pancakes.

*Big kids:* 90 minutes. *Bonus:* 80 minutes – you need 1/3 of the total so that the remaining time will be twice as much, or 2/3 (160 minutes).

*The sky’s the limit:* 11 marshmallows. If all 5 pictures used the same number, they’d each use up 10 marshmallows. If we then move a marshmallow from the 2nd photo to the 4th, and 2 marshmallows from the 1st photo to the last, we still use 50 total, but now we’ve used 8, 9, 10, 11, and 12.

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]]>The post Putting the Fun in Fungus appeared first on Bedtime Math.

]]>You might think of mushrooms as just plain little brown slices on your pizza or steak sandwich. But mushrooms can get way more interesting than that. The biggest mushroom ever, which broke the world record in 2014, measured almost 2 feet tall and was bigger than your head. But even more exciting might be the yakoh-take mushroom: it glows in the dark! This fun fungus doesn’t grow to more than an inch tall and an inch wide. But when the mushrooms reach full size, they glow green for about 3 days. That’s how they got their name, which means “night-light mushroom” in Japanese. Then they turn boring greyish-brown like most mushrooms…so if you want glowing pizza topping, you’d better slice ’em up fast.

*Wee ones: *Which is taller, a 1-foot mushroom or a 1-inch mushroom?

*Little kids:* How many glowing mushrooms can you count in this awesome photo? Count as high as you can! *Bonus:* If the mushrooms start glowing on Tuesday at noon and glow for exactly 3 days, on what day do they stop glowing?

*Big kids:* Yakoh-take mushrooms like warm temperatures, growing best at 81 degrees. If your home is 72 degrees inside, how much warmer should you make it to grow yakoh-takes? *Bonus:* If you can see your night-light from 12 feet away but see the mushrooms from 3 times as far, from how far can you see them?

Answers:

*Wee ones:* The 1-foot mushroom, since that’s 12 inches.

*Little kids:* We think we see parts of up to 19 mushrooms! *Bonus:* On Friday.

*Big kids:* 9 degrees. *Bonus:* 36 feet.

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]]>The post Losing Your Marbles, 13,000 at a Time appeared first on Bedtime Math.

]]>Building marble runs is a blast. It feels great to set up ramps, drop a marble at the top and watch it bounce and roll all the way to the end. Now imagine building a marble run that moves thousands of marbles at a time! Jelle Nikkers, who lives in the Netherlands, put together giant slides, zigzag ramps and tipping seesaws to make a giant machine that moves 11,000 marbles at a time. The marbles roll onto a moving ladder that carries 17 on each rung, then dumps them out at the top onto the ramp. Check out the video to see the marbles do all kinds of tricks, and to hear the rushing river-like sound they make!

*Wee ones:* Which has *fewer* marbles, a seesaw holding 5 marbles or a seesaw holding 7 marbles?

*Little kids:* The first seesaw shown tips when it fills with 10 marbles. If 6 have rolled onto it so far, how many more are needed to tip it? *Bonus:* The machine holds 13,000 marbles total, with 11,000 on the move at once. How many marbles are sitting around waiting their turn?

*Big kids:* The whole marble run is 33 feet long and 4 feet wide! If you and your friends are all 5 feet tall, how many of you have to lie head to toe to stretch longer than the marble run? *Bonus:* If it fits inside a perfect rectangle, how far is it to walk all the way around it?

Answers:

*Wee ones:* The one holding 5 marbles.

*Little kids:* 4 more marbles. *Bonus:* 2,000 marbles.

*Big kids:* 7 of you, since 6 of you will stretch only 30 feet. *Bonus:* 74 feet, since you have to walk the 33 twice and the 4 twice.

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