Math Riddles with Answers
Play Math Riddles with answers on Thinkmad. Reveal answers, solutions and challenge your brain.
Math Riddles list
- 'How much is this bag of potatoes?' asked the man. '32lb divided by half its own weight,' said the green grocer. How much did the potatoes weigh?
- 2 men catch 2 fish in 2 minutes. At this rate, how many men could catch 500 fish in 500 minutes?
- 20+20+20=60. How can you make 60 again by using the same number 3 times, but it can’t be 20?
- 8, 5, 4, 9, 1, 7, 6, 3, 2 These numbers are in a specific order. What is the pattern?
- 81 x 9 = 801. What must you do to make the this equation true?
- A 300 ft. train is traveling 300 ft. per minute must travel through a 300 ft. long tunnel. How long will it take the train to travel through the tunnel?
- A bat and a ball cost $1.10. The bat costs one dollar more than the ball. How much does the ball cost?
- A bird has a head 9cm long. The tail is equal to the size of the head plus a half of the size of the body. The body is the size of the head plus the tail. How long is the bird?
- A box of hardware contains nuts and bolts. The bolts account for 25 percent of the number of items in the box. What percentage are the bolts of the entire box?
- A car's odometer shows 72927 miles, a palindromic number. What are the minimum miles you would need to travel to form another?
- 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?
- A certain number has three digits. The sum of the three digits equals 36 times this number. Seven times the left digit plus 9 is equal to 5 times the sum of the two other digits. 8 times the second digit minus 9 is equal to the sum of the first and third. What is the number?
- 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?
- A farmer has 17 sheep and all but 9 die. How many are left alive?
- A farmer has 17 sheep and all but 9 run away. How many are left?
- A frog fell into a well 12 feet deep. He could jump 3 feet, but every time he jumped 3 feet, he fell back 2 feet. How many times did he have to jump to get out of the well?
- A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?
- A half is a third of it. What is it?
- A half is a third of it. What is it?
- A hobo picks up cigarette butts from the ground and can make a cigarette with 4 butts. If he finds 16 cigarette butts, how many cigarettes can he make?
- A large truck is crossing a bridge 1 mile long. The bridge can only hold 14000 lbs, which is the exact weight of the truck. The truck makes it half way across the bridge and stops. A bird lands on the truck. Does the bridge collapse?
- 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?
- A man is walking down a road with a basket of eggs. As he is walking he meets someone who buys one-half of his eggs plus one-half of an egg. He walks a little further and meets another person who buys one-half of his eggs plus one-half of an egg. After proceeding further he meets another person who buys one-half of his eggs plus one half an egg. At this point he has sold all of his eggs, and he never broke an egg. How many eggs did the man have to start with?
- A man was born on January 1st, 23 B.C. and died January 2nd, 23 A.D. How old did he live to be?
- A rubber ball is tossed off the top of a 90 foot building. Every time it bounces, it goes back up half way. How many bounces will the ball take before it stops?
- A sphere has three, a circle has two, and a point has zero. What is it?
- A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?
- A woman is walking down a street night at a constant pace. As she passes the street light, she notices that her shadow becomes longer. Does the top of her shadow move faster, slower or the same when the shadow is longer as when it is shorter?
- Add me to myself and multiply by 4. Divide me by 8 and you will have me once more. What number am I?
- Adored by few, Feared and hated by many. Mistress of the entire universal reason, Master in the art of numbers. Some may have solved many of your mysteries, But there still much of them to find. What are they?
- An apple is 40 cents, a banana is 60 cents and a grapefruit is 80 cents. How much is a pear?
- An officer wishing to arrange his men in a solid square found by his first arrangement that he had 39 men left over. He then started increasing the number of men on a side by one, but found that 50 additional men would be needed to complete a new square. How many men did the officer have?
- At a children's party, 10 kids had juice, 8 kids had cake, and 6 kids had juice and cake. How many kids were there at the party?
- Can you arrange four nines to make it equal to 100.
- David is throwing Robert a surprise birthday party but he has to stay within his budget. He spent half of his money plus $2.00 on the cake. Half of what he had left plus $2.00 was spent on balloons and streamers. Then he spent half of what he had left plus $1.00 on candy. Now he is out of money, how much did he start with?
- Dean Sam and Castiel are three brothers. Interestingly their current age is prime. What's more interesting that difference between their ages is also prime. How old are they?
- Divide 20 by half and add 30, what do you get?
- Double my number, I'm less than a score. Half of my number is less than four. Add one to my double when bakers are near. Days of the week are still greater, I fear.
- Edward is as old as Benjamin used to be when Edward was as old as Benjamn is now. Benjamin is 36. How old is Edward?
- Eggs are $0.12 a dozen. How many eggs can you get for a dollar?
- Farmer Brown came to town with some watermelons. He sold half of them plus half a melon, and found that he had one whole melon left. How many melons did he take to town?
- Find the four-digit number in which the first digit is one-fourth of the last digit, the second digit is 6 times the first digit, and the third digit is the second digit plus 3.
- Find the missing number: 3, 9, 27, 81, ____? | Puzzle answer
- Five times the difference of twice a number and three, decreased by the sum of this number and eight, equals thirteen.
- Four years ago, Alex was twice as old as Jake. Four years from now, Jake will be 3/4 of Alex's age. How old is Alex?
- Given two 2s, "plus" can be changed to "times" without changing the results: 2 + 2= 2 x 2. The solution with three numbers is easy too: 1 + 2 + 3= 1 x 2 x 3. What is the answer for 4 numbers and for 5 numbers?
- How can you add 8 8's to make 1000?
- How can you add eight 8's to get the number 1000?
- How can you get 4 from 5?
- How can you give someone $63 using six bills, without using any one dollar bills?
- How can you give someone $63 using six bills, without using any one dollar bills?
- How can you give someone $83 using exactly 7 bills, without using any one dollar bills?
- How can you insert the numbers 1-9 inclusive each only, into the calculation to arrive at the answer 100? ( - ) + + - - - = 100
- How can you make six into an odd number?
- How can you make the following equation true by drawing only one straight line: 5+5+5=550? Can you figure it out?
- How can you measure nine minutes with have two hourglasses, one four minute and one seven minute?
- How do you make the number 7 an even number without addition, subtraction, multiplication or division?
- How many 9′s are there between 1 and 100?
- How many days are there in 4 years?
- How many months have 28 days?
- How many pluses should we put between the digits of 987,654,321 to get a total of 99, and where?
- How many seconds are there in one year?
- How many times can you subtract five from twenty-five?
- How much dirt is in a hole 4 feet deep and 2 feet wide?
- I am a place, in a state. I am an answer to a math problem. The math problem is: To get a cube, you multiply something by 6. What do you multiply by?
- I am a three-digit number. All of my digits are prime. One of the numbers is even. Each of my numbers are used only once. The total of my first and last digits equals 10. The total of my first two digits equals 5.
- I am a two-digit number. All my digits are even. No two digits are the same. None of my digits are prime numbers. I am not a multiple of ten. My tens digit is bigger than my other numbers. If you followed all the previous steps, there should be three options remaining the number is the option where if you add all the digits it's exactly in the middle (in how big the number is) of all the other options with their digits added together. What number am I?
- I am an odd number, take away two letters and I am even
- I am an odd number. Take away one letter and I become even. What number am I?
- I am as simple as a circle, worthless as a leader; but when I follow a group, their strength increases tenfold. By myself I'm practically nothing. What am I?
- I am four times as old as my daughter. In 20 years time I shall be twice as old as her. How old are we now?
- I have 10 red socks and 10 blue socks in a drawer. How many socks must I take out to ensure that I have at least one matching pair? One how many to ensure I have at least a pair of red and a pair of blue?
- I have five and take away two, yet I am left with four. How is this possible?
- I’m not the sort that’s eaten, I’m not the sort you bake, Don’t put me in an oven; I don’t taste that great, But when applied correctly, around me you will find, Problems are so simple when my digits come to mind
- If 1/2 of 5 is 3, then what is 1/3 of 10?
- If 10 bags of jelly beans and 6 licorice sticks cost $1, and 10 licorice sticks and 6 jelly bean bags cost 92 cents. How much does one licorice stick cost?
- If 3 cats can kill 3 rats in 3 minutes, how long will it take 100 cats to kill 100 rats?
- If 3 salesmen can sell three cars in seven minutes, how many cars can six salesmen sell in seventy minutes?
- If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?
- If 6 doubloons are worth 1 1/2 ducats, how many ducats are 27 doubloons worth?
- If half of 5 were 3, what would one-third of 10 be?
- If it is two hours later, then it will take half as much time till it's midnight as it would be if it were an hour later. What time is it?
- If it takes four rat catchers four minutes to kill four rats, how many rat catchers would be needed to catch 50 rats in 50 minutes?
- If Mr. Flynn is 90 centimeters plus half his height, how tall is he?
- If seven people meet each other and each shakes hands only once with each of the others, how many handshakes will there have been?
- If the zookeeper had 100 pairs of animals in her zoo and if two pairs of babies are born for each and every one of the original animals, and then sadly 23 animal don’t survive, how many animals do you have left in total?
- If two hours ago, it was as long after one o'clock in the afternoon as it was before one o'clock in the morning, what time would it be now?
- If two is a company and three is a crowd, what are four and five?
- If two's company and three's a crowd, what are four and five?
- If two's company, and three's a crowd, what are four and five?
- If you are cold where do you go to become hot?
- If you can purchase 8 eggs for 26 cents, how many can you buy for a cent and a quarter?
- If you go to the movies and you are paying, is it cheaper to take one friend to the movies twice or two friends to the movies at the same time?
- If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?
- If you had five mangoes and two bananas in one hand and two mangoes and four bananas in the other hand, what would you have?
- If you have three oranges and you take away two, how many will you have?
- If you multiply this number by any other number, the answer will always be zero. What number is this?
- If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?
- If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door.
- In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?
- In a bicycle race, the man who came two places in front of the last man finished one ahead of the man who came fifth. How many contestants were there?
- In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half the lake?
- 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?
- In olden days, the student of logic was given this problem: If half of 5 were 3, what would one-third of 10 be?
- In two years I know, I'll be twice as old as five years ago, said Tom. How old is Tom?
- It is the offspring of a circle and a rectangle.
- It takes the town hall clock 6 seconds to strike 4 o'clock in the afternoon. How long does it take to strike midnight?
- It's always above the negatives Yet it's lower than the first prime no matter how you multiply it's the same every time
- Janie's friends were chipping in to buy her a wedding shower present. At first, 10 friends chipped in, but 2 of them dropped out. Each of the 8 had to chip in another dollar to bring the amount back up. How much money did they plan to collect?
- 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?
- Jenna wrote all the numbers from 300 to 400 on a piece of paper. How many times did she write the digit 3?
- Joe has ten coins totaling $1.19. From these coins, he cannot make exact change for a dollar, half-dollar, quarter, dime, or nickel. What are the coins?
- 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?
- Math time. If you are cold where do you go to become hot?
- Matt is the fiftieth fastest and the fiftieth slowest runner in his school. Assuming no two runners are the same speed, how many runners are in Matt’s school?
- Mom and dad have four daughters, and each daughter has one brother. How many people are in the family?
- Mr. and Mrs. Smith were walking home from the shopping mall with their purchases when Mr. Smith began to complain that his load was too heavy. Mrs. Smith turned to her husband and said, "I don't know what you're complaining about because if you gave me one of your parcels, I would have twice as many as you and if I gave you just one of mine, we would have equal loads." How many parcels was each carrying?
- Mr. Grumper grumbles about bad time-keeping trains like everybody else. On one particular morning he was justified, though. The train left on time for the one hour journey and it arrived 5 minutes late. However, Mr. Grumper's watch showed it to be 3 minutes early, so he adjusted his watch by putting it forward 3 minutes. His watch kept time during the day, and on the return journey in the evening the train started on time, according to his watch, and arrived on time, according to the station clock. If the train traveled 25 percent faster on the return journey than it did on the morning journey, was the station clock fast or slow, and by how much?
- Mr. Smith has 4 daughters. Each of his daughters has a brother. How many children does Mr. Smith have?
- My age today is three times what it will be three years from now minus three times what my age was three years ago. How old am I?
- My daughter has many sisters. She has as many sisters as she has brothers. Each of her brothers has twice as many sisters as brothers. How many sons and daughters do I have?
- Once upon a time there were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?
- One brick is one kilogram and half a brick heavy. What is the weight of one brick?
- One fourth of the population of a newly discovered planet have 4 legs. The rest have two legs. There are 60 legs total. How big is the population of the newly discovered planet?
- One out of 9 otherwise identical balls is overweight. How can it be identified after 2 weighings?
- Out of 100 ladies attending the gala,85 had a white hand bag;75 had black shoes;60 carried an umbrella;90 wore a ring; How many ladies must have had all four items?
- Place three matches on a table. Tell a friend to add two more matches to make eight.
- Placed above it makes greater things small. Placed beside it makes small things greater. In matters that counts it always comes first. Where others increase it keeps all things the same. What is it?
- Raise me none, and I'm unbeaten. Raise me once, I am as well. Raise me thrice, and I am eaten. All said right, but wrongly spelled. Who am I?
- Robert and David played several golf matches against each other in a week. They played for a pizza at each match, but no pizzas were purchased until the end of the week. If at any time Robert and David had the same number of wins, those pizzas were canceled. Robert won four matches (but no pizzas), and David won three pizzas. How many rounds of golf were played?
- Sally is 54 years old and her mother is 80, how many years ago was Sally's mother three times her age?
- Take two numbers, such that the square of the first, plus the square of the second, shall equal 8; while the first, plus the product of the first and second, shall equal 6. What are the two numbers?
- Taking that internship in a remote mountain lab might not have been the best idea. Pulling that lever with the skull symbol just to see what it did probably wasn't so smart either. But now is not the time for regrets because you need to get away from these mutant zombies...fast. Can you use math to get you and your friends over the bridge before the zombies arrive? Alex Gendler shows how.
- The ages of a father and son add up to 66. The father's age is the son's age reversed. How old could they be?
- The combined age of Jack and John is 49. Jack is twice as old, as John was when Jack was as old as John is now. How old are the brothers?
- There are 12 kids in a classroom. 6 kids are wearing socks and 4 are wearing shoes. 3 kids are wearing both. How many are bare feet?
- There are 2 ducks in front of 2 other ducks. There are 2 ducks behind 2 other ducks. There are 2 ducks beside 2 other ducks. How many ducks are there?
- There are 25 red balls, 47 green balls and 3 blue balls in a basket. There is a blind man. What is the minimum number of balls that the blind man has to pick to make sure that there are at least 2 balls of different colors?
- There are two ducks in front of a duck, two ducks behind a duck and a duck in the middle. How many ducks are there?
- There is a three digit number. The second digit is four times as big as the third digit, while the first digit is three less than the second digit. What is the number?
- There was a girl half my age when I was 12, now I am 64, how old is she?
- This number added to it's square, and the digits of that summation added together, bring it back to itself. What is it?
- Three point one four, one five nine two six five, three five eight nine... What am I?
- Three times what number is no larger than two times that same number?
- Two fathers and two sons go fishing. Each of them catches one fish. So why do they bring home only three fish?
- Two legs I've got, Which never walk on ground; But when I go or run, One leg turns round
- Two wine merchants arrive at the gates of Paris. One has 64 and the other 20 barrels of wine. Since they have not enough money to pay the custom duties, the first pays 40 francs and 5 barrels of wine. The second pays 2 barrels of wine but receives 40 francs in change. What is the value of each barrel of wine and what is the duty payable?
- Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation
- What 3 positive numbers give the same result when multiplied and added together?
- What did 0 say to 8?
- What did 2n-1 say to 2n?
- What did number 2 say to number 1?
- What did one math book say to another?
- What did one math book say to another?
- What did one math book say to the other math book?
- What do mathematics teachers like to eat?
- What do the numbers 11, 69, 88, and 96 all have in common?
- What do the numbers 11, 69, and 88 all have in common?
- What happened to the plant in the math classroom?
- What happened to the plant in the math classroom?
- What is half of two plus two?
- What is the difference between a dollar and a half and thirty five-cents?
- What is the most useful instrument in a mathematics teacher's tool kit?
- What is the value of 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 1000?
- What number do you get when you multiply all of the numbers on a telephone's number pad?
- What number is that, which, added separately to 100 and 164, shall make them perfect squares?
- What number is twice the sum of it’s digits?
- What odd number becomes even when beheaded?
- What single-digit number should go in the box with the question? 6 5 9 2 7 1 4 3 5 ? 8 0 2 8 1
- When I was 10, Mary was half my age. Now I'm 50, how old is Mary?
- When my father was 31 I was 8. Now he is twice as old as me. How old am I?
- When my father was 31 I was 8. Now he is twice as old as me. How old am I?
- Where can you place one line to make the following true, 5+5+5=550?
- Why is it easier to count cows than sheep?
- Why should you never mention the number 288 in front of anyone?
- Why was the math book always so depressed?
- You go to the doctor because you're ill and he prescribes you with 3 pills and tells you to take them every half hour. How long do the pills last you?
- You have 14 brown socks, 14 blue socks and 14 black socks in your sock drawer. How many socks must you remove (without looking to be sure) to have a matched pair?
- You have 14 brown socks, 14 blue socks and 14 black socks in your sock drawer. How many socks must you remove (without looking to be sure) to have a matched pair?
- Your shirt has two holes in it. How many holes are there?
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