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Math Riddles for Kids

Everyone loves a good old Math riddle. Riddle for our Math Riddles for Kids.


See some math riddles for kids that you want to check out around this time of the year:

  • Why should you never mention the number 288 in front of anyone? Because 288 is too gross (2*144 = two gross)!
  • If you multiply this number by any other number, the answer will always be the same. What number is this? Zero
  • Add the number to the number itself and then multiply by 4. Again divide the number by 8 and you will get the same number once more. Which is that number? Any number
  • A frog fell into a hole that was 14½ feet deep. He could jump 3 feet, but he slid back a foot each time he jumped. How many jumps does it take him to get out of the hole? Every 3 feet jump accompanied by a 1 foot slide equals 2 feet high jumps each; at this rate, so the 7th jump, starting at 12 feet, brings him to 15 feet, which takes him out of the hole.
  • A man is twice as old as his little sister. He is also half as old as their dad. Over a period of 50 years, the age of the sister will become half of their dad’s age. What is the age of the man now? He is 50 years old.
  • 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 10,000. Can you solve this in a single step? 1000! 1/10 of 10,000 give 1000. (Everything gets cancel out if you multiply all of these fractions and the remaining will be 1/10)
  • A grandfather, two fathers and two sons went to the movie theater together and everyone bought one movie ticket each. How many tickets did they buy in total? 3 (the grandfather is also a father and the father is also a son)
  • There are 10 apples with you, and 10 friends who want them. You give each an apple, yet one apple remains in the basket...how is this possible? Well, it's simple, you give 9 apples to your friends, and the last apple you give to your 10th friend with the basket!
  • I am an odd number; take away an alphabet and I become even. What number am I? 7 (SEVEN-S=EVEN)
  • Mary bought a round cake for her kid’s birthday and saw 6 unexpected guests at house. So she has to cut the cake into 8 pieces. As her kid was 3 years old, they insisted on making 3 cuts on the cake during the celebration. How can she make this possible? Consider a middle point of the cake in its vertical position. Make a cut horizontally till it makes a round to reach the same point again. This makes the cake into exactly half (two round cakes as if placed in a stack). Second cut has to be made in a vertical fashion that passes through the two round cakes. This makes it 4 pieces of cakes. Now make a horizontal cut in the similar fashion that cut these 4 pieces into half again which makes it a total of 8 pieces.
  • In an alien land far away, half of 10 is 6. If the same proportion holds true, then what is 1/6th of 30 in this alien land? 6
  • You have a barrel of beer and you need to measure out just one gallon. How do you do this if you only have a three-gallon container and a five-gallon container? Fill the 3-gallon container with beer and pour it into the 5-gallon container. Then fill the 3-gallon container again and keep pouring it into the 5-gallon container till the latter is full to the brim. One gallon will be left in the 3-gallon container.
  • I'm there once in a minute, twice in a moment but never in a thousand years. Who am I? The letter M!
  • Why is the longest human nose on record is only 11 inches long? Because then it wouldn't be a nose any more; it would become a foot! (12 inches and above - easy!)
  • What weighs more - a pound of iron or a pound of feathers? Both would weigh the same - come on, a pound remains a pound, irrespective of the object!
  • If a rooster laid 13 eggs, and the farmer took 8 of them, and then another rooster laid 12 eggs and 4 of them were rotten, how many of the eggs were left? Roosters don't lay no eggs!
  • I am a three digit number. My second digit is 4 times bigger than the third digit. My first digit is 3 less than my second digit. Who am I? 141
  • 27 ducks are marching to the pond. 5 lose their way, 13 return, and 9 of them make it to the pond. What happens to the rest of them? None are remaining!( 27-5= 22, 22-13= 9, 9-9=0!!!)
  • A cell phone and phone case cost $110 in total. The cell phone costs $100 more than the phone case. How much was the cell phone? $105 (not $110)
  • It takes 12 men 12 hours to construct a wall. Then how long will it take for 6 men to complete the same wall? No time! There is no need of constructing it again as the job is already done.
  • If it took 6 people 9 hours to build a barn, how long would it take 12 people to build the same barn? None, the barn is already built!
  • A 40-yard long street has a tree every 10 yards on both sides. How many trees are there? 10, 5 on either side
  • Jake weighs half as much as Joe, and John weighs three times as much as Jake. Together, they weigh 720 pounds. How much does each man weigh? If Joe weighs twice as much as Jake, and John three times as much, dividing their total weight by six gives us Jake's weight (think x + 2x + 3x = 720). 720 divided by 6 tells us that Jake weighs 120 pounds, so Joe weighs 240 pounds and John weighs 360 pounds.
  • Tom was asked to paint the number plates on 100 apartments which means he will have to paint numbers 1 through 100. Can you figure out the number of times he will have to paint the number 8? 20 times. (8, 18, 28, 38, 48, 58, 68, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 98)
  • You are given a telephone and asked to multiply all the numbers on the device’s number pad. What will be the answer? zero (The number pad contains number 0. When you multiply any number by zero, the answer will be zero)
  • Jeff has $28.75. He purchased three cookies that cost $1.50 each, five newspapers that each cost $0.50, five flowers for $1.25 each, and used the remainder of the cash on a pair of sunglasses. How much were the sunglasses? $15.50
  • A mobile phone and its case cost Rs. 110 in total. The price of the mobile phone is Rs.100 more than its case. What is the price of the mobile phone? Rs.105 (not Rs.110)
  • A duck was given $9, a spider was given $36, a bee was given $27. Based off of this information, how much money would be given to a cat? $18 ($4.50 per leg)
  • 100 coins fell down and got scattered inside a dark place. 90 of the coins fell with heads facing up and the rest 10 coins fell with tails up. You are asked to sort out these coins into 2 piles. However, each pile should have the same count of tails up coins. How is it possible? First of all the piles need not be of the same size. I can make 2 piles, one with 90 coins and the other with 10 coins. Now I just flip all of the 10 coins on the pile. So the piles will have the same count of tails.
  • There are 6 black socks, 8 brown socks, 4 blue socks, and 2 red socks in my sock drawer. Can you figure out the minimum number of socks to be pulled out in order to get a matching pair for sure? At least 5
  • A merchant can place 8 large boxes or 10 small boxes into a carton for shipping. In one shipment, he sent a total of 96 boxes. If there are more large boxes than small boxes, how many cartons did he ship? 11 cartons total; 7 large boxes (7 * 8 = 56 boxes), 4 small boxes (4 * 10 = 40 boxes),11 total cartons and 96 boxes.
  • If you can purchase 8 eggs for 26 cents, how many can you buy for a cent and a quarter? Eight
  • What is the maximum possible number of times you can subtract number 5 from number 25? Only once. This is because when you subtract 5 from 25 for the first time, it becomes number 20, then 15 and so on.
  • If you buy a rooster for the purpose of laying eggs and you expect to get three eggs each day for breakfast, how many eggs will you have after three weeks? Zero, roosters do not lay eggs
  • X is an odd number. Take an alphabet away from X and it becomes even. Which is that number? Seven (Seven-S=Even)
  • So you think you're good at math? Complete the sequence: 1=3, 2=3, 3=5, 4=4, 5=4, 6=3, 7=5, 8=5, 9=4, 10=3, 11=?, 12=? 6. That is the number of letters in the spelling of each number!
  • How many 9's are there between 1 and 100? Twenty 9's
  • In a certain country ½ of 5 = 3. Assuming the same proportion, what would be the value of 1/3 of 10 ? 4
  • Raj has 2 books. One of the books is faced upside-down and the second book is rotated which makes the top of the book facing Raj. Then what will be the total sum of the 1st pages in each of these books? 2. Regardless of how the books are oriented, the first page of every book is page number 1. So 1 + 1 = 2!
  • If you multiply me by any other number, the answer will always remain the same. Who am I? zero
  • If you have 6 black socks, 4 blue socks, 8 brown socks, and 2 red socks in your sock drawer, what is the minimum number of socks that you need to pull out in the dark to be sure you had a matching pair? At least 5, so that at least one color has two socks!
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  • How many eggs can you put in an empty basket one foot in diameter? Only one egg, because after that the basket doesn't remain empty any more!
  • Mary has three coins of American currency. They are neither quarters, dimes, nor pennies, but they add up to 60 cents. What are they? A 50 cent and 2 nickels!
  • A woman has 7 daughters and they each have a brother, how many children does she have? 8 children, the sisters have just one brother!
  • There are 100 pairs of dogs in a zoo. Two pairs of babies are born for every dog. Unfortunately, 23 of the dogs have not survived. How many dogs would be left in total? 977 dogs (100 x 2 = 200; 200 + 800 = 1000; 1000 – 23 = 977)
  • Which has more value - 1 pound of $20 gold coins or half a pound of $40 gold coins? Twice of half a pound is one pound - figured it out yet?
  • How many two cent stamps are there in a dozen? 12, a dozen of anything is still 12!
  • The price of a duck is Rs. 9, a spider costs Rs. 36 and a bee was priced Rs. 27. By taking into account this information, what will be the price of a cat? Rs.18 (Rs. 4.50 per leg)
  • A little boy goes shopping and purchases 12 tomatoes. On the way home, all but 9 get mushed and ruined. How many tomatoes are left in a good condition? Nine
  • I have a barrel of wine and your job is to measure out one gallon from it. I can give you a five-gallon container and three-gallon container? How can you help me? First of all fill up the 3 gallon container with wine. After that you have to transfer the same to the 5 gallon container. Then fill up the 3 gallon container again and transfer the wine to the 5 gallon container until it is full. The left over in the 3-gallon container is 1 gallon of wine.
  • William has a toaster with 2 slots. So he can toast one side each of 2 breads simultaneously which takes 1 minute. He wanted to make 3 pieces of toast for his breakfast. What is the minimum time required to do so? 3 minutes! First of all, he can put two pieces of bread in the toaster. After 1 minute, one side each of the 2 breads get toasted. He can then flip a side of bread and take the other one out. And he can place the 3rd piece of bread into the free space of the toaster. After the second minute, he can take the completely toasted bread out and flip the other one. Then place the half toasted bread into the free space to toast the fresh side. After 3 minutes, all 3 pieces of breads gets toasted.
  • Eggs are $0.12 a dozen. How many eggs can you get for a dollar? 100 eggs, at one penny each
  • If you take 3 apples from a group of 5, how many do you have? Three - you just took them yourself!
  • Robin tosses a coin 10 times and it landed in the heads up position all ten times. So what are the possible chances for him to toss it up again and gets landed in heads up position? He has a 50 percent chance to toss the coin and see the heads up position. This is because the coin toss is not dependent on the first 10 tosses.
  • I have a pound of feathers and a pound of iron? Can you please tell me which one weighs more? Both of them would be of same weight. A pound remains a pound despite the type of object.
  • You are given 3 positive numbers. You can add these numbers and multiply them together. The result you get will be the same. Which are the numbers? 1, 2 and 3
  • Add 2 to 200 four times? What do you have? 202, 202, 202, 202
  • Maria went to the bread store to buy a loaf of bread for dinner. She had 2 quarters, 4 dimes, 3 nickels and 2 pennies. The total cost of the bread $0.82. She promised to make sure she had exactly 1 coin remaining after purchase. Which coins did she have left after buying the loaf of bread? One of the quarters
  • Aron had twelve ear buds in front of him. He took one away. Now he had nine in front of him. How is this possible? The remaining buds were arranged to form the figure of 9!! How else??