The post When Dogs Jump Rope appeared first on Bedtime Math.

]]>It’s fun to skip rope on your own, but it’s even more exciting when two friends swing a giant rope for you. You have to run in without tripping, then jump over and under it as it circles around. Well, as this hilarious video shows, this group of 13 dogs has gotten pretty awesome at group jumprope. The rope swings down, and all 13 dogs go flying at the exact same time to hop over. In fact, they’ve set the Guinness World Record for the greatest number of dogs jumping at once! Getting even *one* dog to jump rope is a trick in itself, but Uchida Geinousha’s Super Wan Wan Circus has figured it out. They taught the pooches how to skip by making it part of playtime. It has become their favorite thing to do. Now, if we could only get them to ride a unicycle…

*Wee ones:* Can you count to 13 to count those dogs? Try it and see how high you can go!

*Little kids:* If the 1st dog makes it over the rope, and the 3rd, and the 5th…which dog do you think should hop over next? *Bonus:* If 13 dogs try to jump but the shortest dog trips, how many make it over the rope?

*Big kids:* How many poodle paws do the 4 jumping poodles have? *Bonus:* If the circus has also trained lots of backup dogs, and these 13 dogs are just 1/4 of the total, how many dogs does the circus have?

*The sky’s the limit:* The world record for people skipping on the same rope is 300! How many more feet do those jumpers have than the 13 record-breaking dogs?

Answers:

*Wee ones:* 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13!

*Little kids:* The 7th dog, since every other dog makes it. *Bonus:* 12 dogs.

*Big kids:* 16 paws. *Bonus:* 52 dogs.

*The sky’s the limit:* 548 more jumping feet. The people have 2 feet apiece, or 600 feet, and the 13 furry 4-footed dogs have 52 feet.

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]]>The post Where Home Is a Tight Squeeze appeared first on Bedtime Math.

]]>How many presidents can come from 1 state? Well, right now, the answer is 8 presidents, and those 8 were born in Virginia! The next closest state is Ohio, with 7 presidents. Another great math fact about this state is that 1/2 the people in America live within 500 miles of its capital, Richmond. On a much smaller scale, it’s home to the skinniest home in America. The “Hollensbury Spite House” is only 7 feet wideand 25 feet long. It was originally built almost 200 years ago to close off an alley, to keep out noisy pedestrians and wagons that kept bumping into the houses along either side. But people still live in it today!

*Wee ones: *4 presidents came from Massachusetts and 2 from Vermont. Which state has had more presidents?

*Little kids: *How many more presidents would have to come from Virginia to bring its total to 10? *Bonus: *How wide is 7 feet? Lie down with your arms stretched over your head. Then ask a grown-up to measure your length. Is it more or less than 7 feet?

*Big kids: *You can fit only 12 people on each of the 2 floors of the Hollensbury Spite House. But if you use the patio too, 30 people total can hang out at the house. How many people fit on the patio? *Bonus: *If the house is 7 feet wide and 25 feet long, how many square feet does 1 floor of the house have?

Answers:

*Wee ones: *Massachusetts, because 4 is more than 2.

*Little kids: *2 more presidents, because 8 + 2 = 10. *Bonus: *Different for everyone, but we bet you’re not quite 7 feet long when you stretch out like that!

*Big kids: *6 people on the patio. A total of 24 people fit inside the house, and 30 – 24 = 6. *Bonus: *175 square feet, because 25 x 7 = 175, or 25 + 25 + 25 + 25 + 25 + 25 + 25 = 175.

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]]>The post The Fairest of Them All appeared first on Bedtime Math.

]]>When Minnesota calls itself The Land of 10,000 Lakes, it’s rounding down the numbers. The state actually has more than 11,000 lakes! But one thing Minnesota brags about is its state fair, which is happening right now. Last year 2 million people came to this big party, more than 1/3 of all the people in the state. The fair has famous musicians, animal contests, and of course, lots of tasty food on sticks. Speaking of which, Minnesotans are also proud to be the birthplace of Frank Mars, inventor of the Snickers, Milky Way and 3 Musketeers bars. Then his son brought us M&Ms. We can see why Minnesotans seem so sweet.

*Wee ones: *Chocolate bars are brown on the outside. Find 3 brown things in the room, and if they’re small enough, put them in a row from smallest to biggest.

*Little kids: *If you have 2 of each of those candy bars (Snickers, Milky Way and 3 Musketeers), how many candy bars do you have in total? *Bonus: *The state fair runs for 12 days. If you have 2 weeks to visit Minnesota, do you have enough time for the whole fair?

*Big kids: *The Milky Way was invented in 1923. How many years from now will it have its 100th birthday? *Bonus: *If you’re trading M&Ms for Snickers, and 6 M&Ms are equal to 1 mini-Snickers, and 4 mini-snickers are equal to 1 full-size Snickers, what’s a fair number of M&Ms for a full-size Snickers?

*The sky’s the limit: *If you wanted to swim in 10,000 of Minnesota’s lakes, and can travel to 5 lakes per day for the 100 warm-enough days each year, how many years will it take you to swim in those 10,000 lakes?

Answers:

*Wee ones: *Items might include shoes, socks, pants, wooden blocks…and maybe even some chocolate!

*Little kids:* 6 candy bars. *Bonus: *Yes! 2 weeks is 14 days, because 7 + 7 = 14, and that’s more than 12.

*Big kids: *4 years from now, in 2023. *Bonus: *24 M&Ms, because 6 x 4 = 24.

*The sky’s the limit: *20 years. You can visit 500 lakes per year. 2 years gets you to 1,000 lakes, so you need 10 sets of those 2-year pairs to reach 10,000.

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]]>The post A State You’ll Go Nuts Over appeared first on Bedtime Math.

]]>Aloha! That’s how you say hello – and goodbye – in our next state. Hawai’i is the only state made up completely of islands (over 100). Also, people live longer there than people from any other state – why is that? Maybe it’s the warm weather, or the beautiful beaches with pink sand…or maybe it’s the macadamia nuts. The macadamia is one of the butteriest, yummiest nuts you can eat – if you can crack open its tough shell. You need to crush the nut with 300 pounds per square inch to crack it! They used to spread the nuts out on the road and drive trucks over them to break them open. Last year Hawai’i grew about 25,000 tons of macadamias…what would that pile look like? Read on to figure it out!

*Wee ones:* Hawai’i has 8 large islands out of the 100. Can you show the number 8 with your fingers?

*Little kids:* If you eat a dark-chocolate-covered macadamia nut, then a milk chocolate one, then a plain one, then repeat over and over since they’re so yummy, what flavor is the 9th nut you eat? *Bonus: *How many nuts of each flavor did you eat?

*Big kids:* If you and your friends each weigh 50 pounds, how many of you need to pile onto a 1-inch-square nut to weigh 300 pounds to crack it? *Bonus**:* If you eat dark-chocolate macadamias, twice as many milk chocolate macadamias as dark chocolate, and 3 times as many cookies n’ cream macadamias as dark chocolate, and you eat 18 in total…how many of each do you eat?

*The sky’s the limit: *If there are 10 macadamia nuts in 1 ounce, how many nuts are in 1 ton? (Reminder: 1 pound has 16 ounces, and again, 1 ton has 2,000 pounds.)

Answers:

*Wee ones:* See if you can hold up 8 fingers – you’ll need to use 2 hands!

*Little kids:* A plain nut. *Bonus:* 3 nuts of each flavor.

*Big kids:* 6 of you. *Bonus**:* 3 dark chocolate, 6 milk, and 9 cookies n’ cream. Think of it as sets: each dark-chocolate nut has 2 milk friends and 3 cookies friends, making a set of 6. Then there are 3 of those sets in 18.

*The sky’s the limit: *320,000 macadamia nuts in 1 ton, or about a third of a million! 10 x 16 = 160 nuts in 1 pound. From there, to multiply by 2,000 you can first multiply by 1,000, then double what you get. 160 x 1,000 = 160,000, and then 160,000 x 2 = 320,000.

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]]>One of the best parts of a road trip is trying the food in each crazy new place, and Georgia has all kinds of goodies. As the Peach State they obviously grow peaches, but they also grow more pecans than any other state. And both of those make tasty toppings for another treat: the waffle. Waffle House is a restaurant with locations in exactly half our country’s states, but it started in Georgia. There are 2,100 Waffle Houses today, and 439 of them are in Georgia! They say they sell 2% of all the eggs in America, or 1 out of every 50. Since they cook the food so quickly, and serve it 24 hours per day, that just might be true.

*Wee ones: *What shape is the waffle in that picture? And what shape are the holes in it?

*Little kids: *If you cut a skinny strip of 5 waffle squares, and squirt syrup in every other square starting with the 1st, how many squares get syrup? *Bonus: *If your waffle has 3 rows of 3 squares each, how many squares does it have?

*Big kids: *If a waffle has 6 rows of 6 squares each, how many squares are along the edges, and how many aren’t? *Bonus: *If 1 egg makes batter for 2 waffles, and your first 30 customers each want 3 waffles plus a fried egg, how many eggs do you need to make the meals?

*The sky’s the limit: *If 439 of the 2,100 Waffle Houses are in Georgia, does the state have more than 1/4 of all Waffle Houses? Can you get the answer with a shortcut?

Answers:

*Wee ones: *A circle waffle, with square holes.

*Little kids: *3 squares: the 1st, 3rd and 5th. *Bonus: *9 squares, because 3 + 3 + 3 = 9, or 3 x 3 = 9.

*Big kids: *20 squares are along the edges: 6 in the top row, 6 in the bottom, and then 4 more on the left edge and 4 more on the right (so we don’t double-count the corners). There are 6 x 6 = 36 squares total so that leaves 16 in the middle – which makes sense, since it’s a 4 x 4 shape that’s left! *Bonus:* 75 eggs. The 30 customers together want 90 waffles, which use 45 eggs (90/2). Then we add the 30 eggs, at 1 egg per person.

*The sky’s the limit:* Not quite. We know if there were just 2,000 Waffle Houses, Georgia would need 500 of them to have 1/4…and they have fewer than 500 out of more than 2,000.

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]]>The post The 40th-ish State appeared first on Bedtime Math.

]]>Today we’re visiting either the 39th or the 40th state to join our country: North Dakota! We don’t know whether North or South Dakota became a state first. The President at the time, Benjamin Harrison, didn’t want either state bragging about being first, the way your older sibling might. So he shuffled the certificates that made them states and signed without looking. What we do know is that Mr. Bubble bubble bath was invented here, which might be more important. It also produces the most honey of any state. But what will really make you say “Holy Cow!” is Salem Sue. Salem Sue is the world’s largest statue of a Holstein cow, standing 38 feet tall, 50 feet long, and weighing 6 tons. That sure makes her easy to spot.

*Wee ones: *Holstein cows are black and white. Can you find 1 white object, 1 black object, and 1 object that is both black and white?

*Little kids: *If North Dakota was the 40th state, how many of our 50 states became states after it? *Bonus: *If 1 bottle of bubble bath can last you 10 days, but lasts a cow only 2 days, how many bottles of bubble bath will the cow use in the time you use 1?

*Big kids: *If an average Holstein cow stands 5 feet tall, how many cows would need to stand on each others’ shoulders to be taller than 38-foot tall Salem Sue?* Bonus: *If there are 1.75 million cows and there are twice as many cows as people in North Dakota, can North Dakota have more than 1 million people?

Answers:

*Wee ones: *Objects might include socks, shoes, bedsheets, cellphones…and for black and white together, printed pages from books!

*Little kids: *10 states. *Bonus: *The cow will use 5 bottles of bubble bath, because 2 + 2 + 2 + 2 + 2 = 10 days.

*Big kids: *8 cows, since that would make them 40 feet tall. *Bonus: *No, there would have to be at least 2 million cows to keep the 2:1 cow:people ratio.

*The sky’s the limit: *3 people and 9 cows. Since 1 cow has 2 times as many hooves as people have feet, you know that there must be 3 cows per person in order to have 6 times as many hooves as feet (the person has 2 feet, and that person’s cows have 12). That makes a set of 4 swimmers in total. If there are 12 swimmers, there are 3 of these sets. That gives us 3 people (1 per set) and 9 cows (3 per set, x 3). You can check: the 3 people have 6 feet, and the 9 cows have 36 feet, which is 6 times as much.

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]]>The post You Donut Wanna Miss Mass appeared first on Bedtime Math.

]]>Massachusetts might be the trickiest state name to spell. But people here spell one treat the easier way: donut. Massachusetts is wild for Dunkin’ Donuts, or as locals call it, Dunkin’. There’s one store for every 6,500 people in the state. In the capital city of Boston, you’re never more than 1 1/2 miles from a Dunkin’. There’s another great ring shape in this state: the basketball hoop! Basketball was invented in Springfield, Massachusetts in 1891. The first basketball game was played with a soccer ball and actual fruit baskets nailed to a wall. There were 9 players on each team, and the final score was just 1-0. So this state gave us not just Dunkin’, but slam dunking too!

*Wee ones: *Find a basket of some kind (or mark off a circle on the floor) and find 3 soft things to throw into it (balled-up socks, small stuffed animals, etc.). Stand halfway across the room and throw each thing towards the basket. How many landed in it? How many landed elsewhere: to the left, right, front, or behind? Try it again!

*Little kids: *If the 1st player on a basketball team scores, then the 3rd, then the 5th…which one do you guess is next? *Bonus: *If there were 9 players on each team in the first basketball game, and just 1 basket was scored, how many players in the whole game did not score?

*Big kids: *If you want to bring 2 donuts for every basketball player at a game, how many more donuts would you need if the teams have 9 players each than 5 players each?* Bonus: *If a Dunkin’ sells 5 boxes of 25 donut holes and 12 boxes of 12 full-sized donuts, which do they sell more of, full-sized donuts or holes?

*The sky’s the limit: *If you have a giant box of donuts, and you eat 1/5 of them today, 1/4 of what’s left tomorrow, and then 1/3 of what’s left the next day, what fraction of the original box is left after that?

Answers:

*Wee ones: *Different for everyone…see where your soft “basketballs” land!

T*he sky’s the limit:* 2/5 of the donuts are left. When you eat 1/5 of them, you’re left with 4/5. 1/4 of that is 1/5 (you have 4 of those, so each is 1/4 of the total). Once you eat that, you have 3/5 left. Eating 1/3 of that means eating another one of those fifths, so you’re left with 2/5.

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]]>The post Big Star State appeared first on Bedtime Math.

]]>They say that everything’s bigger in Texas. That’s definitely true for cowboys’ hats and the ranches they work on. One ranch in Texas is bigger than the whole state of Rhode Island! It makes sense when you think about how hungry cows are. Depending on a cow’s size, it can eat 25-30 pounds of grass, hay, and other food in a day. Cows can walk pretty far, too, so you need about 10-15 acres for every cow. An acre is about 3/4 the size of a football field. 1 human worker has to take care of 800 or even 1,000 cows. So ranchers get help from herding animals like horses and dogs. Horses can walk more than 30 miles per day – a lot easier for them to chase cows than for us to do it!

*Wee ones: *Texas is called “The Lone Star State” and only has 1 star on its flag. Count the points on that star.

*Little kids: *If a cowboy is riding a horse next to a cow, how many legs do the 3 of them have all together? *Bonus: *If 1 cow needs 10 acres of land to walk around and eat, how many acres do 3 cows need?

*Big kids: *Another famous Texas animal is the 9-banded armadillo. How many bands would be in a group of 9 9-banded armadillos? *Bonus: *Believe it or not, both armadillos and cows are good at jumping. If an armadillo jumps 3 feet, a cow jumps 6 feet, and you jump in the exact middle of those 2 heights, how high do you jump?

Answers:

*Wee ones: *5 points.

*Little kids: *10 legs: 2 human + 4 horse + 4 cow legs. *Bonus: *30 acres of land, because 10 + 10 + 10 = 30.

*Big kids: *81 bands. *Bonus: *You jump 4 1/2 feet high. The difference between the cow and armadillo’s height is 3 feet, so you jump 1 1/2 feet higher than the armadillo and 1 1/2 feet lower than the cow. 3 + 1 1/2 = 4 1/2.

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]]>The post Michigan Can Keep Cool appeared first on Bedtime Math.

]]>Michigan is that mitten-shaped state that wraps around 4 of the Great Lakes. Its name comes from the Native American Ojibwe word “mishigamaa” meaning “large lake.” There’s no spot in Michigan where you’re more than 85 miles from a Great Lake. In fact, there’s so much water in Michigan – 11,000 lakes and ponds, and 36,000 miles of streams – that you’re never more than 6 miles from any natural source of water. 4 out of every 10 square miles in the state are covered with water! Imagine if your neighborhood was like that, with 4 ponds for every 6 houses. Easy to keep cool in the summer!

*Wee ones:* Michigan has lots of water. Plug a sink and fill it with some water. To celebrate the 5 Great Lakes, splash your hands in it 5 times as you count!

*Little kids:* Michigan touches 4 of the 5 Great Lakes. How many Great Lakes don’t touch Michigan? *Bonus:* Michigan was the 26th state to join the Union. What number was Florida, which joined next?

*Big kids:* Lot of boats enjoy all that Michigan water. If there are 800,000 boats and 10 people can ride in each one, can all 10 million Michigan residents ride in the boats at the same time? *Bonus: *Michigan has the most lighthouses of any state, with 124 lighthouses standing. How many more lighthouses is that than the 65 lighthouses in Maine?

*The sky’s the limit: *It takes you 10 minutes to jog 1 mile and 15 minutes to swim 1 mile. If you travel 75 minutes either jogging or swimming only whole miles, and you jog more miles than you swam, how many miles must you have jogged, and how many did you swim?

Answers:

*Wee ones: *Count 1, 2, 3, 4, 5 as you splash!

*Little kids: *1 Great Lake. *Bonus: *The 27th state.

*Big kids: *Not quite – 10 people in 800,000 boats makes 8,000,000, or 8 million, riders. So 2 million Michiganders will have to wait their turn! *Bonus: *59 more lighthouses in Michigan. Michigan has 124 total and 124 – 65 = 59.

*The sky’s the limit: *You jogged 6 miles and swam 1 mile. You know you must swim an odd number of miles for the total time to have a 5 in the ones place. 5 miles of swimming would take exactly 75 minutes, which leaves no minutes for jogging. 3 miles of swimming would take 45 minutes, which would leave 30 minutes, or 3 miles of jogging – still not enough jogging to jog more miles than you swim. So it must be 1 mile of swimming, or 15 minutes, plus the 60 minutes in 6 miles of jogging.

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]]>The post Crabby and Merry appeared first on Bedtime Math.

]]>Well, our next state is actually called Maryland, not merry land. But there are plenty of reasons to be happy we’re here! Maryland is one of just 6 states with an official “crustacean”: the blue crab. Even though it’s a small state, half our country’s blue crabs come from Maryland. Lots of Maryland restaurants have huge sculptures of crabs on their roofs, big enough to see from a hot air balloon. And in fact, the first American to fly in a hot air balloon was a 13-year-old kid named Edward Warren. He took off from Baltimore, Maryland in 1784. Edward got to fly because he was much lighter than the balloon’s grown-up owner. Whether you have 8, 2, or 0 legs on the ground, you’ll feel lucky to be here!

*Wee ones: *Does an 8-legged crab have more legs than you?

*Little kids: *If you take your pet crab for a walk on the beach, how many legs do you have all together?* Bonus: *How many human friends would have to join you to have as many people legs as crab legs?

*Big kids: *If Edward Warren flew 78 feet up into the air, many yards high did he fly? (Reminder: A yard has 3 feet.) *Bonus: *For how many years have we had hot air balloons flying in America? (Reminder: That first flight was in 1784.)

Answers:

*Wee ones: *Yes, because 8 is more than 2.

*Little kids: *10 legs. *Bonus: *3 friends, because you include your own 2 legs in the count, and 2 + 2 + 2 + 2 = 8.

*Big kids: *26 yards. To divide by 3 more easily, you can break 78 into 2 smaller numbers and divide them by 3: 78 is 60 + 18, and 60 / 3 = 20 while 18 / 3 = 6. Then put it together: 20 + 6 = 26. *Bonus: *235 years.

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