find out just how much the large and famous Trevi Fountain in Rome!

The post Trevi Treasure Trove appeared first on Bedtime Math.

]]>The Trevi Fountain in Rome, a giant statue of marble men and horses swimming in rushing water, is the biggest fountain in the famous city. This isn’t just a little angel statue that looks like it’s peeing: the fountain stretches 161 feet across and stands 86 feet tall! The legend is that people who throw coins into the fountain will have a safe return to Rome again in the future – but you have to throw the coin over your left shoulder using your right hand. People seem happy to do this, since the fountain collects over $3,000 of coins every day! As with most fountains, the coins are collected and used to buy food and clothing for people in need. Since it’s our last Money Math Monday of the month, let’s find out how much money those marble men and mares round up each year.

*Wee ones:* If you and 3 friends each throw a coin in the fountain, how many coins do you throw?

*Little kids:* If the marble statues include 3 men and 2 horses, how many statues are in the fountain? *Bonus:* How many legs do they all have together?

*Big kids:* If the fountain caught exactly $3,000 of money per day, how much would it catch in a week? (*Hint if needed:* you can add and multiply “thousands” the way you add apples, cookies or anything else.) *Bonus:* About how long does it take the fountain to catch $100,000 — a month, a year, longer?

Answers:

*Wee ones:* 4 coins.

*Little kids:* 5 statues. *Bonus:* 14 legs (6 on the people, 8 on the horses).

*Big kids:* $21,000. *Bonus:* About a month — it will take just over 33 days, which would be $99,000.

And thank you to our friends at the Council for Economic Education for partnering with us this month!

The post Trevi Treasure Trove appeared first on Bedtime Math.

]]>The post Big-Jumping Bunnies appeared first on Bedtime Math.

]]>Horses are great runners and jumpers. So sometimes they strut their stuff in jumping shows, where they have to leap over tall fences without tripping. But a much jumpier animal now does this, too: rabbits! In this video, we see sporty, fluffy bunnies compete in rabbit show jumping. It’s tricky to teach rabbits to do this: they aren’t as smart as horses, and have to run while on a leash so they don’t wander off. Sometimes their human friend has to “re-set” the bunny to a better spot to jump. But in that straight course of 12 “hurdles,” or little fences, the winning bunnies jump over all 12. They also train to see who can jump the highest and the farthest, with the world long-jump record reaching almost 10 feet! We humans like to run the hurdles, the high jump and the long jump, too…so when you’re a big kid, you can be a jumper, too.

*Wee ones:* The checkerboard hurdle is the 4th one in the Straight Jump course. How many hurdles do the bunnies have to jump over before that one?

*Little kids:* If every 3rd bunny makes it over the checkerboard hurdle (starting with the 3rd bunny), will the 7th bunny make it? *Bonus:* If 2 bunnies tie on the number of hurdles they cleared, the faster one wins. If one does it in 1 minute 47 seconds and the other does it in 2 minutes 3 seconds, who went faster?

*Big kids:* The record-winning rabbit jump was 9 feet 10 inches. How far short of 10 feet is that? (Hint if needed: A foot has 12 inches.) *Bonus:* If each hurdle is 5 feet apart from the next, how far does the bunny run from the 2nd hurdle to the 8th hurdle?

*The sky’s the limit:* If the bunny has just 5 hurdles left, and jumps only 2 of them, how many possible pairs of 2 hurdles could that be?

Answers:

*Wee ones:* 3 hurdles.

*Little kids:* No (the 6th will have made it). *Bonus:* The first bunny is faster.

*Big kids:* 2 inches shy. *Bonus:* 30 feet.

*The sky’s the limit:* 10 pairs. There are 4 pairs that use the 1st hurdle (1-2, 1-3, 1-4, 1-5), then 3 new pairs use the 2nd hurdle (2-3, 2-4, 2-5), then 2 more using the 3rd hurdle (3-4, 3-5), and finally 4-5 as the last. So we get 1+2+3+4, or 10 pairs.

The post Big-Jumping Bunnies appeared first on Bedtime Math.

]]>The post Picnic in Your Pocket appeared first on Bedtime Math.

]]>Well, okay, it’s actually a picnic *table*, and it can’t quite fit in your pocket. But we’re amazed by this fold-up picnic table and chair set. Woodworker Izzy Swan and his buddies invented a table where the 4 chairs can fold up together to fit under the table legs. As they show in this video, you just lift up that table leg frame, put the chair chunk on top of it, and then pull down on 1 stool to force all 4 seats to pop out. Then more pieces of wood fold out to make the full tabletop. You still need to pack your picnic lunch, but with this easy to carry table, you can take that picnic and eat it any place you want.

*Wee ones:* What shapes do you see in this table? What shapes are the tops of the chairs, the leg frames, and the tabletop itself?

*Little kids:* If the table top starts by having 4 sides and then unfolds to become 8-sided, how many new sides popped out? *Bonus:* How many total shapes make the tabletop? If you can’t see in the video, it has a center square, 4 rectangles around it, and 4 triangles at the corners…

*Big kids:* If you got together 17 people plus yourself for a picnic, how many of these tables would you need to have a seat for everyone? *Bonus:* How many pieces of wood would the guys have to cut for all those table tops, if they need a square, 4 rectangles and 4 triangles for each?

Answers:

*Wee ones:* The chairs are circles, the leg frame is square on top, and then the tabletop has 8 sides, making it an octagon! And you might see even more shapes.

*Little kids:* 4 new sides. *Bonus:* 9 pieces.

*Big kids:* 5 tables, since 4 will seat only 16 people. *Bonus:* 45 pieces, since each tabletop needs 9.

The post Picnic in Your Pocket appeared first on Bedtime Math.

]]>The post Swinging in the Rain appeared first on Bedtime Math.

]]>As the weather warms up, we get to do all kinds of fun things outside, like swinging on a swing, or running through the sprinkler. Guess what – you can now do both of those things at the same time! Four guys came together and built a great invention: a waterfall swing. As you zoom back and forth, water sprays down on you from 384 little holes in the pole across the top. The tiny streams coming from them make a wall of water. Best of all, a tray under the swings catches all the water and pumps it back up to the top to spray you again, so you don’t waste water. Now you just need a waterfall jungle gym slide and a waterfall seesaw, and you’ll have a totally “cool” playground.

*Wee ones:* If you’re counting the streams of water and you count 6, what number comes next?

*Little kids:* If you swing forward on your first pass through the spray, then backwards, then forwards…which way are you moving on the 9th pass? *Bonus:* On how many of those were you swinging forward?

*Big kids:* If the swing can spray 3 gallons of water on you every minute, how much water hits you after 5 minutes? *Bonus:* For how many full minutes would you have to swing to get soaked with at least 25 gallons of water?

Answers:

*Wee ones:* 7.

*Little kids:* Forward. *Bonus:* On 5 of them (on 1, 3, 5, 7, and 9).

*Big kids:* 15 gallons. *Bonus:* 9 minutes, since 8 will bring you to just 24 gallons.

The post Swinging in the Rain appeared first on Bedtime Math.

]]>The post Lego You Can Wear appeared first on Bedtime Math.

]]>If you’ve ever played with Lego, you know you can stack those blocks into all kinds of wild castles and treehouses, cars and rockets. But people like to make real-life shapes out of Lego, too. In fact, a company has invented a purse made of real Lego blocks. A purse is a small pouch that (usually) girls use to carry money, pens and other small things. A husband and wife in Poland, the Biernackis, drill tiny holes in real Lego blocks, then string them together tightly on string like beads. They then take that “bag” and line the inside of it with soft cloth. Finally, for the latch they snap on thin Lego blocks that are coated in real gold! The purse sells for $300…if you get one, you can snap your own Lego of any color onto it so it matches any outfit you wear.

*Wee ones:* Which has more knobs (bumps), the gold part of the purse or the blue part?

*Little kids:* The latch uses 2 thin gold bricks that each have 4 knobs. How many knobs does the whole latch have? *Bonus:* If you wanted the latch to have 12 knobs, how many knobs long would each gold bar have to be?

*Big kids:* If the front of the purse is 7 bricks long and 6 bricks wide, how many bricks does it use? *Bonus:* If they changed it to be 8 bricks long and 5 bricks wide, would that use more or fewer bricks?

*The sky’s the limit:* If the purse is 7 bricks long and 6 bricks wide on the front, where all bricks have 8 knobs each, and you make a Lego house on the front of it that covers 100 knobs, how many knobs of blue sky are left showing? (*Hint if needed*: To multiply by 8, you can double the number, then double again, then double one more time, since that’s the same as 2x2x2.)

Answers:

*Wee ones:* The blue part.

*Little kids:* 8 knobs. *Bonus:* 6 knobs.

*Big kids:* 42 bricks. *Bonus:* It would use fewer, since it would be 40 vs. 42.

*The sky’s the limit:* There are 42 bricks in total, and each has 8 knobs. Doubling gives us 84, doubling that gives us 168, and doubling again gives us 336. If you cover 100 of the knobs with other bricks, that leaves 236 blue knobs showing.

The post Lego You Can Wear appeared first on Bedtime Math.

]]>The post A Message for Astronauts appeared first on Bedtime Math.

]]>When astronauts fly hundreds of miles above us, Earth looks really small to them. They can’t pick out cars or houses or roads – it’s all too tiny to see from up there. But a girl whose dad is an astronaut really wanted him to see her from space, or at least something she had made. So car company Hyundai sent 11 cars to “write” giant letters on the ground that he could see from the floating International Space Station. 12-year-old Stephanie drew a message on paper: “Steph (heart)’s You!” Then Hyundai mapped out those same shapes on the Nevada’s Delamar Dry Lake, a giant, smooth area of desert. The cars drove in a row with studs on their tires to carve into the sand. The letters had to be thousands of feet tall for him to read them from space, and covered 59 million square feet! To celebrate Earth Day today, watch this video to see how they did it!

*Wee ones:* How would you count those 11 cars? Count as high as you can!

*Little kids:* How many letters did the cars drive? Count the letters in “Steph,” “s” and “you”! *Bonus:* If the name Steph is 2,000 feet tall, the heart is 3,000 feet, and the you! is 2,000 feet tall, how tall are the 3 rows together?

*Big kids:* If 11 cars drove with studs on all 4 tires on each, how many studded tires helped draw this picture? *Bonus:* If 11 cars drove and each is 6 feet wide, and there were 3 feet between any 2 cars next to each other, how thick are the stripes in those letters?

Answers:

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

*Little kids:* 9 letters (5+1+3). *Bonus:* 7,000 feet tall.

*Big kids:* 44 tires. *Bonus:* 96 feet (wider than most houses). The 11 cars take up 66 feet, and there are 10 gaps between them, adding 30 more feet.

The post A Message for Astronauts appeared first on Bedtime Math.

]]>The post A Great /’BERTH-,da/ appeared first on Bedtime Math.

]]>When you say a bunch of words, other people know what you’re saying because they know those same words. If you make up a bunch of gobbledygook, they won’t have a clue what you’re talking about. But how do we know what words are real words? The dictionary! It’s a list of all the words in a language, and today is the dictionary’s 187th birthday: on this day in 1828, Noah Webster printed the first one in America. Now when someone talks about a dudgeon, borborygmus or astrobleme, you can check whether they’re real words. They are: a dudgeon is a long-ago word for a knife, borborygmus is the rumbling of your stomach when you’re hungry, and an astrobleme is a crater from a meteor (flying rock) hitting Earth (from the Greek words for star and boo-boo). This makes you wonder: how many words does the dictionary have?

*Wee ones:* If “collywobbles” has 12 letters and “argle-bargle” has 11, which word has more letters?

*Little kids:* If you decide to learn 3 new words a day, how many new words do you learn over a weekend (Saturday and Sunday)? *Bonus:* At that rate, can you learn at least 15 in a week?

*Big kids:* The dictionary today has about 1 million words! Do you know how to write one million in digits (numbers)? *Bonus:* People speak about 150 words per minute. If you say 150 words but 10 of those are words you made up, how many real words did you say?

*The sky’s the limit:* If the 3rd version of the dictionary had exactly 470,000 words, but then they decided to take out borborygmus because it sounds so silly, how many words would be left?

Answers:

*Wee ones:* Collywobbles has more.

*Little kids:* 6 words. *Bonus:* Yes, because you would learn 21 words in a week.

*Big kids:* 1,000,000. *Bonus:* 140 real words.

*The sky’s the limit:* 469,999 words.

The post A Great /’BERTH-,da/ appeared first on Bedtime Math.

]]>The post High Fiverr appeared first on Bedtime Math.

]]>Money is what we use to buy things, but to spend it you have to earn it first. That’s why grown-ups work at jobs: to make money to buy food, clothes and everything else we need. Well, on the website Fiverr, people who want to earn more money can offer to do any crazy job for $5. One person will draw your face in pizza using sauce and cheese, for just $5. Another will tattoo a message onto a banana or apple for you. A third will help you name your new pet, and another will teach you how to play chess better. And best of all, one person will plant a cashew tree in Guatemala to help out the farmers down there. For Money Math Monday today, think about what *you* would be willing to do for $5…and once you get that $5, you can hire that lady to tattoo a banana for you!

*Wee ones:* If *you* tattoo bananas and want to charge $7, is that more or less than what Fiverr lets you charge?

*Little kids:* If you have 3 new guinea pigs and you pay $5 for help with each name, how much do you spend? *Bonus:* If you then spend $3 on chew toys for them, now how much have you spent in total?

*Big kids:* If you want to buy a new bike and work 7 jobs through Fiverr, how much money do you earn for that new bike? *Bonus:* Here’s a cool math trick: multiplying by 5 is the same as multiplying by 10 and then dividing by 2. So if you have an even number, you can cut it in half first, then tack on a zero and you have 5 times that number! If you do 42 jobs on Fiverr, how much do you earn? How about for 64 jobs? Or 120 jobs?

Answers:

*Wee ones:* $7 is more than $5.

*Little kids:* $15. *Bonus:* $18.

*Big kids:* $35. *Bonus:* $210, $320, and $600!

And thank you to the Council for Economic Education for doing Money Math Mondays with us this month!

The post High Fiverr appeared first on Bedtime Math.

]]>The post Why Did the Chicken Cross the Road? appeared first on Bedtime Math.

]]>To show off its cool new clothes, of course. These feathered friends are wearing High Vis Chicken Jackets, made by a company called Omlet (they’re named after the omelet, a very eggy breakfast treat). They make them for people who own chickens as pets. Chicken pet owners like to let their birds wander around the yard day and night, but chickens aren’t very smart and will walk right out in front of a speeding car on the road. Thanks to this squawk-worthy safety attire, drivers can see the chickens in time to slow down, even in the dark. You can see the chickens strut their stuff here. Now these owners can play with their pets happily for years, and collect a lot more eggs for those omelets.

*Wee ones:* How many legs in total do these 2 chickens have?

*Little kids:* High Vis jackets come in pink or yellow. If you dress 1/2 of your 8 pet chickens in pink and the rest in yellow, how many are wearing yellow? *Bonus:* If all the pink chickens have crossed the road, and 3 yellow chickens cross over to join them, how many more chickens have crossed the road than not?

*Big kids:* If a car is about to reach the chicken crossing in 22 seconds, and a chicken watches from the side for 13 seconds and then takes 8 seconds to cross, does it make it all the way across in time? *Bonus:* If chicken fans buy 300 of these jackets, and they buy twice as many yellow as pink, how many of each do they buy?

*The sky’s the limit:* If once the rooster crows a new chicken crosses the road every 15 seconds, and each takes 5 seconds to waddle across, will a car passing by at 52 seconds make it through safely?

Answers:

*Wee ones:* 4 legs.

*Little kids:* 4 chickens. *Bonus:* There are 6 more chickens who’ve crossed, since there are 7 across and 1 still waiting.

*Big kids:* Yes! It finishes in 21 seconds. *Bonus:* 200 yellow, 100 pink.

*The sky’s the limit:* Yes! Chickens start crossing at 15 seconds, then 30, then 45. The chicken at 45 seconds gets across by the 50-second mark.

The post Why Did the Chicken Cross the Road? appeared first on Bedtime Math.

]]>The post Real-Life Superhero Cars appeared first on Bedtime Math.

]]>It’s a big job to build a car, since cars these days have about 30,000 parts. Never mind that some of those parts weigh hundreds of pounds! But when robots help out, we humans have a much easier time. In this awesome video, the electric car company Tesla shows their giant factory robots, which are all named after X-Men characters: Beast, Professor Xavier, and so on. Long-ago car maker Henry Ford figured out that if each worker did the same job over and over — one person snaps on the left front door, another person does the right front door, and so on — then cars could be built faster. These superhero robots do the same thing, except they’re also superhero strong. They can hold up the whole frame of the car while its robot friends bolt more parts onto it. As a result, Tesla’s factory can crank out 400 cars in a week. We bet the robots wish they could go out for a drive in one.

*Wee ones:* If you get to work with the robots Iceman, Storm, and Beast, how many X-Men robots do you work with?

*Little kids:* If Iceman snaps on 2 windows, Beast adds 4 doors and Storm snaps on the front windshield, how many parts did they add? *Bonus:* If Professor Xavier and Wolverine each add 3 parts, who added more, the first superhero group or the second group?

*Big kids:* If Iceman adds 900 pounds of parts to the car and a door weighs 200 pounds, what’s the biggest number of doors he could have added? *Bonus:* If Tesla makes 400 cars every week, how many can they make this spring (13 weeks)?

Answers:

*Wee ones:* 3 robots.

*Little kids:* 7 parts. *Bonus:* The first group (7 is more than 6).

*Big kids:* Up to 4 doors, which would be 800 pounds (5 doors would go over, as they’d weigh 1000). *Bonus:* 5,200 cars!

And thank you Callie, Devin and their dad Ajay for sending this awesome video!

The post Real-Life Superhero Cars appeared first on Bedtime Math.

]]>