Math Riddles with Answers : While riddles often serve the function of entertaining the audience by proposing challenging questions to be solved, they also serve other purposes. For instance, they may allow for deeper thinking regarding an issue or to allow other questions to arise.
Math Riddles
Riddle: What occurs twice a week, once a year but never in a day?
Answer: The letter E.
Riddle: The total cost of a pair of shoes and a hoodie is $150. The hoodie cost $100 more than the pair of shoes. How much does each item cost?
Answer: The hoodie costs $125, and the shoes cost $25.
Riddle: You have two U.S. coins with a total value of 30 cents. One of them is not a nickel. What are the two coins?
Answer: One is a quarter, and one is a nickel.
Riddle: I am a three-digit number. My tens digit is six more than my ones digit. My hundreds digit is eight less than my tens digit. What number am I?
Answer: 193
Riddle: A man is twice as old as his little sister. He is also half as old as his dad. Over a period of 50 years, his sister’s age will become half of their dad’s age. What is the age of the man now?
Answer: 50 years old
Riddle: If four men can build four tables in four hours, how many can eight men build in eight hours?
Answer: 16 tables
Riddle: There is a clothing store in Dallas. The owner has made his own method of pricing items. A vest costs $20, socks cost $25, a tie costs $15, and a blouse costs $30. Using the method, how much would a pair of underwear cost?
Answer: $45
Riddle: 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?
Answer: It’s cheaper to take two friends at the same time.
Riddle: A little boy goes shopping and purchases 12 tomatoes. On the way home, all but nine get mushed and ruined. How many tomatoes are left in good condition?
Answer: Nine tomatoes.
Riddle: What 4 days of the week start with the letter T?
Answer: Tuesday, Thursday, Today, and Tomorrow.
Riddle: What occurs once every minute, twice in every moment, and yet never in a thousand years?
Answer: The letter M.
Riddle: How did the soccer fan know before the game that the score would be 0-0?
Answer: The score is always 0-0 before the game.
Riddle: Add the number itself, then multiply by 4. Then divide the number by 8, and you will get the same number once more. Which number is that?
Answer: Any number will suit.
Riddle: What can be put between 7 and 8 to get the result of more than 7, but less than 8?
Answer: a decimal point, as you get 7.8.
Riddle: Tom was asked about his age. “In two years, my age will be twice my age five years ago”, he said. How old is he now?
Answer: Tom is 12 now; five years ago, he was 7; and in two years, he will be 14.
Riddle: Use four 9’s to get 100.
Answer: 99 + 9:9 = 100.
Riddle: Sean and Gemma are waiting for their second kid. If the elder kid is a boy, then what is the chance to have another boy?
Answer: 50 percent.
Riddle: How can you get 1,000 by using eight 8’s and addition?
Answer: 888 + 88 + 8 + 8 + 8 = 1,000.
Riddle: Four men can make four chairs in four hours. If so, how many chairs can be made in 8 hours by eight men?
Answer: 16 chairs.
Riddle: Get 28 using five 2’s.
Answer: 2+2+2+22= 28.
Riddle: If you divide 100 by half, What will be your answer?
Answer: 100 / half
i.e, 100 divided by ½
= 100 x 2/1
= 200
Riddle: There are 6 black socks, 8 brown socks, 4 blue socks, and 2 red socks in my wardrobe. How many socks should be pulled out in order to get a matching pair for sure?
Answer: 5.
Riddle: Seven men met each other. Each of them shakes hands only once with each of the other men. Count the total number of handshakes.
Answer: 21.
Riddle: You are given a telephone and asked to multiply all the numbers on the device’s number pad. What will be the answer?
Answer: zero (The number pad contains number 0. When you multiply any number by zero, the answer will be zero)
Riddle: 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?
Answer: He is 50 years old.
Riddle: X is a three-digit number. The tens digit is 5 more than the ones digit. The hundreds digit is 8 less than the tens digit. What is X?
Answer: Number 194.
Riddle: Add 8 4s together to give a total of 500 as the answer?
Answer: 4+4+4+44+444= 500
Riddle: 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?
Answer: 2. Regardless of how the books are oriented, the first page of every book is page number 1. So 1 + 1 = 2!
Riddle: Tom and Peter live in different parts of the city but study in the same high school. Tom left for school 10 minutes before Peter started and they happened to meet at a park. At the time of their meeting, who was closer to the school?
Answer: They are both at the same distance from school as they met in the same place.
Riddle: 100 girls were attending a party. 85 of them had a red bag, 75 of them have worn brown shoes, 60 of them came with an umbrella and 90 girls wore a ring. How many girls have had all these four items?
Answer: 10
Riddle: 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?
Answer: 141
Riddle: You are given a sequence: 1 11 21 1211 111221 312211. Can you figure out the next number in this sequence?
Answer: 13112221 (Each of the number in the sequence is the description of the previous number. If you start with 1, the 2nd number is 11 (one 1), third number is 21 (two 1’s), fourth number is 1211 (one 2, one 1) and so on.
Riddle: What is a math teacher’s favorite dessert?
Answer: Pi (e)
Riddle: Jill has 3 sons and each of them have a sister. How many kids does Jill have?
Answer: 4, the brothers have one sister
Riddle: What can you put between 4 and 6 to make the answer greater than 4 and lesser than 6?
Answer: a decimal point. 4.6 is greater than 4 and lesser than 6
Riddle: What three numbers give you the same result whether they’re added or multiplied?
Answer: 2+2+2 = 6 and 2x2x2 = 6
Riddle: If you add this number with another number, the result is always more. However, if you multiply this number with any other number you get nothing. What is it?
Answer: 0
Riddle: Anna brought home a rooster for eggs. If the rooster sits on the fence and laid two eggs and one fell on the other side, is it Anna’s or her neighbor’s?
Answer: Neither Anna’s nor her neighbors because roosters don’t lay eggs
Riddle: If 2 is a twin and four is a quadruplet, what are 3 and 5?
Answer: 8
Riddle: Two moms and two daughters are baking. Yet, there are only 3 cakes at the end. How is this possible?
Answer: There are only 3 people in the kitchen, one mother, her daughter and the daughter’s daughter!
Riddle: What did the triangle say to the circle?
Answer: You’re pointless.
Riddle: It takes 10 men two months to dig a tunnel. How many days will it take 20 men to dig the same tunnel?
Answer: 0, the tunnel’s already dug!
Riddle: If I say a circle has two sides, am I wrong?
Answer: No, a circle has an inside and an outside, so the statement is correct.
Riddle: One is to three as three is to five and five is to four and four is the magic number. What is the pattern?
Answer: One has three letters in the word three has five letters in it five has four letters and four has four letters in it (if you try more numbers they will always come back to the number four: so four is the magic number)
Riddle: If a boy blows 18 bubbles, Then pops 6 eats 7 and then He pops 5 and blows 1. How many are left?
Answer: 1.
Riddle: 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? (3 possible solutions).
Answer: 51 and 15. 42 and 24. 60 and 06.
Riddle: Pick a number from 1-10, multiply it by 2, add ten, divide it by 2, now subtract the number that you have from the number you picked. What is it?
Answer: Do you have 5?
Riddle: What two whole, positive numbers have a one-digit answer when multiplied and a two-digit answer when added?
Answer: 1 and 9.
Riddle: You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer, and a five-minute timer, how can you boil the egg for only two minutes?
Answer: Once the water is boiling, turn the three-minute timer and five-minute timer over. When the three-minute timer runs out, put the egg in the boiling water. When the five-minute timer runs out, two minutes have elapsed and it is time to take the egg out of the water. You don’t need the four-minute timer for this riddle.
Riddle: 81 x 9 = 801. What must you do to make the this equation true?
Answer: Turn it upside down. 108 = 6 x 18.
Riddle: How much will a 38° angle measure when looked at under a microscope that magnifies ten times?
Answer: It will still be 38°.
Riddle: If 1=5, 2=15, 3=215, and 4=3215. What does 5 equal?
Answer: 5=1, because 1=5.
Riddle: An apple is 40 cents, a banana is 60 cents, and a grapefruit is 80 cents. How much is a pear?
Answer: 40 cents. The price of each fruit is calculated by multiplying the number of vowels by 20 cents.
Riddle: 81 x 9 = 801. What must you do to make this equation true?
Answer: Flip it upside down. 108 = 6 x 18
Riddle: You want to boil an egg for two minutes but you only have a three-minute hourglass, a four-minute hourglass, and a five-minute hourglass, how can you boil the egg for only two minutes?
Answer: Once the water is boiling, turn the three-minute hourglass and five-minute hourglass over. When the three-minute hourglass runs out, put the egg in the boiling water. When the five-minute hourglass runs out, two minutes have elapsed and it is time to take the egg out of the water.
Riddle: How can you make the following equation true by drawing only one straight line: 5+5+5=550? There are two possible answers.
Answer: Draw a line on the first plus sign that turns it into a 4! The equation then becomes true: 545+5=550.
You could also change the equal symbol to a crossed-out equal symbol which means “not equal to.”
Riddle: I am a three-digit number. My tens digit is five more than my ones digit. My hundreds digit is eight less than my tens digit. What number am I?
Answer: 194
Riddle: 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?
Answer: It’s cheaper to take two friends at the same time. In this case, you would only be buying three tickets, whereas if you take the same friend twice you are buying four tickets.
Riddle: A sphere has three, a circle has two, and a point has zero. What is it?
Answer: Dimensions
Riddle: When I take five and add six, I get eleven, but when I take six and add seven, I get one. What am I?
Answer: A clock
Riddle: Name the favorite dessert of a math teacher.
Answer: Pi(e)
Riddle: If Jake, Jacob, and Jerry attended a football match and each purchased one ticket, how many tickets did they buy in total?
Answer: Three
Riddle: Tom went to the supermarket and bought ten potatoes. On his way home, he discovered that all but nine potatoes were rotten. How many potatoes were edible?
Answer: Nine
Riddle: If two moms and daughters are baking a cake each for Christmas, how many cakes should there be in all?
Answer: Three (because one mom is also a grandmother, and one daughter is also a mom. There are three people: one grandmother, one mother, and one daughter.)
Riddle: What will be the answer if you are given a telephone and asked to multiply all the digits on the pad?
Answer: The answer will always be zero, as the telephone pad has the number 0, and anything multiplied by zero will always be zero.
Riddle: How can you use five 4s to get 55?
Answer: 100
Riddle: In a three-digit number, the second digit is four times greater than the third digit. The first digit is three times less than the double digit. Guess the number.
Answer: 141
Riddle: What would the triangle say to the circle if the triangle and the circle were arguing?
Answer: You don’t have a point.
Riddle: If you place three matches on the table and ask your friend to add two more matchsticks on the table and make it two, how will they do it?
Answer: They can add two matches to the three to make a Roman numeral eight (VIII).
Riddle: How can you get 1000 from the number 8 using only addition?
Answer: 888 + 88 + 8 + 8 + 8 = 1000
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