Hey there, puzzle lovers! Ready to test your brainpower with some math riddles that are way easier than you think? We've got a bunch of fun and tricky questions that'll make you feel like a genius when you crack them. Gather your friends or family and see who can solve them the fastest. Dive in, and let's see who can conquer these deceptively simple math challenges! Animation is created by Bright Side.
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Music by Epidemic Sound https://www.epidemicsound.com
Check our Bright Side podcast on Spotify and leave a positive review! https://open.spotify.com/show/0hUkPxD34jRLrMrJux4VxV
Subscribe to Bright Side: https://goo.gl/rQTJZz
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Our Social Media:
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Instagram: https://www.instagram.com/brightside.official
TikTok: https://www.tiktok.com/@brightside.official?lang=en
Stock materials (photos, footages and other):
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https://www.shutterstock.com
https://www.eastnews.ru
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For more videos and articles visit:
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FunTranscript
00:00We're gonna start out easy. You'll have 10 seconds to make number 7 even.
00:19This is not about math, actually. To make 7 even, you only have to take away the letter S at the beginning of the word.
00:28OK, the next one is a bit trickier. Two 4s skipped dinner. How come?
00:48Because they're 8. I mean, 8. Yeah, these are homophones.
00:54The last riddle to warm you up. So what numbers are always on the moon?
01:12Roman numbers. Roman. Sorry, I couldn't resist the pun. On to more serious stuff.
01:20Let's test your logic, shall we? Take a look at this number sequence.
01:31As you see, one digit is missing. Which digit logically follows this series?
01:49If you pick the number 19, congratulations! You see, each time 5 gets added. 4 plus 5 equals 9. 9 plus 5 equals 14. And 14 plus 5 equals 19.
02:09The numbers 6 in between other digits stay the same. They do not change and act more like a frame for all the other digits.
02:19Now take a look at this picture. How many triangles are there? Again, I'm going to help you a bit. So it is 7, 8, 12, 18.
02:31The correct answer is 18. Look, here's how you should count. You have really small triangles on top and bigger ones.
02:53OK, this one is not a riddle, but a quick magic trick to make you the fastest in your class.
03:00If you need to multiply some numbers from 1 to 10 by 9, you don't need anything but your hands.
03:08Place both palms before you and assign each finger a number, just like you can see it on the screen.
03:14If you need to multiply 3 by 9, bend finger number 3. On the right, you still have 7 unbent fingers. That's the first part of the answer.
03:25On the left, only 2. That's the second part. Voila! 9 times 3 equals 27.
03:35Hey, are you a discount hunter? If so, you gotta be quick on counting how much money you're gonna save.
03:41To calculate the discount you're gonna get during a sale without a calculator, use this trick.
03:47For instance, to find out what 5% of 235 is, follow this method.
03:53Step 1. You get 10% of the whole. To do that, just move the decimal point over by one place. 235 becomes 23.5.
04:04Step 2. Keep in mind that 5% is half of 10%.
04:09Divide 23.5 by half. The answer is 11.75. That is also the answer to the original equation.
04:21Alright, this one is just more math magic.
04:25Right, so A% of B equals B% of A. Like 9% of 30 is equal to 30% of 9.
04:36That's it. This trick was really short. I mean, you will probably thank me one day for that when you use it in an exam.
04:45A math trick to save your party. What's bigger? One 18-inch pizza or two 12-inch?
04:52You've got 10 seconds to think.
05:06Well, there are two answers to that.
05:10Geometry claims the area of two 12-inch pizzas is equal to 226 square inches, but the 18-inch pizza is 254 square inches.
05:21Well, from this point of view, you'd rather grab an 18-inch one. But hey, geometry and cooking are two completely different things.
05:29So, it's the weight that matters here. The more the weight is, the more calories there are.
05:33So you know what to choose, and there will be enough pizza for everyone.
05:40Alright, let's have a short pause and have another fun riddle.
05:44So, number 4 wanted to go to a nightclub, but the security didn't let it in. How come?
06:03Because it's two square. I mean, two square. You get the point.
06:09Next one here. This is Triangle Jack, and in the geometry world, everyone says he's rude.
06:16What can rude Jack say to Circle Jerry?
06:20Jerry, you're pointless. Yeah, that doesn't sound quite polite, but it's just geometry. No offense.
06:29Hey, do you know what snake has the most mathematical name?
06:39It's a snake.
06:40Hey, do you know what snake has the most mathematical name?
06:56It's Python.
07:01Back to more serious stuff. Let's assume you need to prove 6 plus 7 equals 1. Can you do that?
07:10Yep, it is indeed correct, but you gotta take a look at that from another perspective.
07:15Let's say these are not numbers, but hours. Do you see what I'm driving at?
07:20Right, 6 a.m. plus 7 hours equals 1 p.m.
07:26Okay, this one is tougher. What if I say 6 a.m. plus 7 hours equals 1 p.m.?
07:31Right, 6 a.m. plus 7 hours equals 1 p.m.
07:37Okay, this one is tougher. What if I say 2 plus 2 equals 5?
07:43Yeah, you may want to advise me on going back to elementary school, but what if I prove it to you? Look here.
07:50Technically, it's wrong, but there are fun methods to prove it otherwise. Here's the simplest method.
07:55Let's assume 0 equals 0. Now, 0 can result from the subtraction of one number with itself.
08:02So let us think that the two figures at the left-hand side and right-hand side are 4 and 10.
08:09So, 4 minus 4 equals 10, minus 10.
08:134 can be written as 2 squared, and 10 can be written as 2 times 5.
08:182 to the power of 2 minus 2 to the power of 2 equals 2 times 5, minus 2 times 5.
08:25And when we twist it a bit, we get 2 minus 2 in brackets, 2 plus 2 in brackets, equals 5, times 2 minus 2 in brackets.
08:35Cancelling 2 minus 2 in brackets from both sides, we get 2 plus 2 equals 5. All proved, right?
08:42Please don't try it out during your math class. I'm sure your teacher won't be impressed. This one is just for fun.
08:50This one's not a math riddle, but yet another magic math trick that may come in handy in an exam.
08:56Here's how you can quickly square a two-digit number that ends in 5.
09:01Let's use the number 35 as an example.
09:04Step 1. Multiply the first digit by itself, plus 1.
09:08Step 2. Put a 25 at the end.
09:1235 squared equals 3 times 3 plus 1 in brackets, and 25.
09:183 times 3 plus 1 in brackets equals 12.
09:2212 and 25 equals 1,225.
09:2735 squared equals 1,225.
09:31Voila! Neat, right?
09:33Here comes another multiplication trick.
09:36To easily multiply any number by 5, simply divide the number by 2 and multiply it by 10.
09:43For example, multiply 64 by 5.
09:47Step 1. Divide 64 by 2 equals 32.
09:51Step 2. Multiply 32 by 10.
09:55All you need to do is add a zero at the end.
09:58You got 320, and you're done!
10:01You got 320, and it only took you 5 seconds!
10:07A bit more magic.
10:09You already know how to multiply by 5 in no time, and you can do the same with multiplying by 6.
10:15Disclaimer. It only works for even numbers.
10:18So, let's see how it works.
10:20Let's say you need to multiply 4 by 6.
10:23First off, you need to divide 4 by 2. You got 2.
10:27Next, place 4 after 2, and you get 24.
10:31That's the final answer!
10:33Yeah, this may not work with bigger numbers.
10:35Seems like it's easier to learn the multiplication table by heart.
10:41Hey, I can read your mind.
10:43If you don't believe me, then think of a number.
10:45Keep it simple. You'll have to do a bit of math here.
10:48And you may probably need a calculator to play this guessing game with me.
10:52So, you think of a number.
10:54Now multiply it by 3.
10:55Done? Okay.
10:57Now add 6.
10:59Next step, you need to divide this number by 3.
11:02Now subtract the number you thought of from the resulting number.
11:06Let me guess. As a result, you got 2, right?
11:10No magic involved.
11:12It's just a smart math riddle. It works with any number.
11:17If you ever struggle to learn all the digits in the pi number, just give up.
11:22There are trillions of them.
11:23But there is a trick to remember at least 7.
11:26Just say, how I wish I could calculate pi.
11:29There are 3 letters in how, 1 in I, 4 in wish, 1 in I again, 5 in could, 9 in calculate, and 2 in pi.
11:41You got 3.141592.
11:48The last but not the least riddle for you.
11:505 people build a barn in 8 hours.
11:53How long will it take 12 people to build a barn?
12:08It won't take any time at all.
12:10Why would they build a new barn if those 5 have already done that?
12:14Give the guys a break.
12:16Plus, this one is not about math at all.
12:18We humans are pretty complicated and we don't obey math that much.
12:22What if these 12 people will split into 2 teams of 6 and start playing volleyball instead of building a barn?
12:48Answer in the comments below.