Number Riddles: What Has No End but Starts with One?

Riddle: I am the only number that is the same whether you read me forwards or backwards and I have three digits. What am I?
Answer: 101

Riddle: What number is next in this pattern: 1, 3, 6, 10, 15, ?
Answer: 21

Riddle: A clock shows 3:15. How many degrees are between the hour and minute hands? (Whole number answer.)
Answer: 7.5 degrees

Riddle: If five cats catch five mice in five minutes, how many cats are needed to catch 100 mice in 100 minutes?
Answer: Five

Riddle: What two whole numbers add to 11 and multiply to 28?
Answer: 4 and 7

Riddle: I am a number that is both a square and a cube. Between 1 and 1000 which number am I?
Answer: 64

Riddle: If you add me to myself and then add 10, you get 30. What number am I?
Answer: 10

Riddle: What number when written in words has the same number of letters as its value?
Answer: Four (4)

Riddle: I am a number where the sum of my digits equals 9, and I am the smallest three-digit number with that property. What am I?
Answer: 108

Riddle: If you divide me by 2, then by 3, then by 4, and the result is 1, what number was I?
Answer: 24

Riddle: I am prime, but if you remove my last digit I am still prime. Between 10 and 100 what am I?
Answer: 23 (23 -> 2 still prime)

Riddle: What number is missing: 2, 4, 8, 32, ? , 32768 (each term is previous raised to a power)?
Answer: 256

Riddle: I am the only even prime number. What am I?
Answer: 2

Number Riddles And Answers

Riddle: I am an odd number. Remove one letter from my name and I become even. What number am I?
Answer: Seven

Riddle: Which number do you get when you multiply all the numbers on a phone keypad (1–9 and 0)?
Answer: Zero

Riddle: I am a three-digit palindrome and my digits add to 6. What number am I?
Answer: 303

Riddle: I am the next number in this sequence: 2, 4, 8, 16, ?
Answer: 32

Riddle: I am a triangular number: 1, 3, 6, 10, 15, … What is the next one?
Answer: 21

Riddle: If you add me to myself and then add 10, you get 30. What number am I?
Answer: 10

Riddle: I am both a square and a cube between 1 and 100. What number am I?
Answer: 64

Riddle: A baker has 12 loaves. He gives half to customers and then gives another 2 away. How many loaves remain?
Answer: 4

Riddle: If three people can build three chairs in three hours, how many chairs can one person build in nine hours at the same rate?
Answer: Three

Riddle: I am even, greater than 10 but less than 20, and my digits add up to 7. What number am I?
Answer: 16

Riddle: I am prime, and if you remove my last digit I am still prime. Between 10 and 100 what am I?
Answer: 23

Riddle: What two whole numbers add to 11 and multiply to 28?
Answer: 4 and 7

Riddle: I am the only even prime number. What number am I?
Answer: 2

Riddle: A squad has 17 players, and all but 9 are injured. How many players can still play?
Answer: 9

Riddle: I start at 1 and each time I add the next whole number: 1, 1+2, 1+2+3,… Which number is 55 in this pattern?
Answer: The 10th triangular number (55)

Riddle: If you divide a number by 2, then by 3, then by 4, and the final result is 1, what number did you start with?
Answer: 24

Riddle: I am the smallest three-digit number whose digits add to 9. What am I?
Answer: 108

Riddle: What number comes next: 1, 4, 9, 16, 25, ? (these are special numbers)
Answer: 36

Riddle: I am the product of two equal whole numbers and I come right after 15. What number am I?
Answer: 16

Hard Number Riddles

Riddle: I am a number that becomes smaller when you turn me upside down. What number am I?
Answer: 9

Riddle: I am a two-digit number. My ones digit is twice my tens digit, and the sum of both digits is 12. What number am I?
Answer: 48

Riddle: I am a number between 1 and 1000. My cube is greater than 100 but less than 200. What number am I?
Answer: 5

Riddle: Divide me by 2 and you get 10. Add 10 and you get 30. What number am I?
Answer: 20

Riddle: I am a number that equals the sum of my digits multiplied by 3. What number am I?
Answer: 18

Riddle: I am a three-digit number. My digits multiply to 36, and my middle digit is twice the last. What number am I?
Answer: 932

Riddle: Add me to myself, then divide by 4, and you get 5. What number am I?
Answer: 10

Riddle: When you divide 30 by half and add 10, what do you get?
Answer: 70

Riddle: I am a number that gives the same result when multiplied by 3 as when you add 12 to me. What number am I?
Answer: 6

Riddle: My digits add up to 11, and if you reverse them, the new number is 27 more than the original. What number am I?
Answer: 47

Riddle: I am a number that equals the sum of all numbers before me, starting from 1. What number am I?
Answer: 8

Riddle: I am a number whose square is double my cube divided by me. What number am I?
Answer: 2

Riddle: If you multiply me by any even number, the result is always even, but I am not even. What am I?
Answer: 1

Riddle: I am a number that when you add me to my square gives 72. What number am I?
Answer: 8

Riddle: I am a two-digit number. If you add my digits, you get 9. If you reverse me, I become 27 less than I was. What number am I?
Answer: 63

Riddle: Multiply me by 5 and add 20, you get the same result as multiplying me by 8. What number am I?
Answer: 20

Riddle: I am a number that divides evenly into 6, 9, and 15. What number am I?
Answer: 3

Riddle: My digits multiply to 8, and if you reverse them, I become 27 less than before. What number am I?
Answer: 42

Mystery Number Riddles

Riddle: I am a two-digit number. My digits add up to 9, and if you reverse me, I become 27 more than before. What number am I?
Answer: 36

Riddle: I am a number that is one less than twice 10. What number am I?
Answer: 19

Riddle: I am a number that becomes double when you add 8 to me. What number am I?
Answer: 8

Riddle: The sum of my digits is 11, and my tens digit is two more than my ones digit. What number am I?
Answer: 56

Riddle: I am a mystery number. If you divide me by 2 and then by 3, the result is 5. What number am I?
Answer: 30

Riddle: I am a number that when multiplied by 4 gives the same result as adding 60 to me. What number am I?
Answer: 20

Riddle: I am a three-digit number. The product of my digits is 24, and the digits go in order. What number am I?
Answer: 234

Riddle: If you double me and subtract 10, the result is 26. What number am I?
Answer: 18

Riddle: I am a number that remains the same when multiplied by 0.5 and added to itself. What number am I?
Answer: 0

Riddle: My digits multiply to 18 and add up to 9. What two-digit number am I?
Answer: 36

Riddle: If you multiply me by 6, the result is 72. What number am I?
Answer: 12

Riddle: I am an even number. If you divide me by 2 and then add 7, the result is 12. What number am I?
Answer: 10

Riddle: I am a mystery number that is 9 more than twice 8. What number am I?
Answer: 25

Riddle: I am a number that gives 15 when added to my half. What number am I?
Answer: 10

Riddle: I am a number whose square is 49 times smaller than 4900. What number am I?
Answer: 10

Riddle: I am a three-digit number. My hundreds digit is twice my ones digit, and my tens digit is 5. What number am I?
Answer: 251

Riddle: I am a number that when you subtract 9 from me, you get one-third of my value. What number am I?
Answer: 13.5

Riddle: I am the only number that is equal to my digits multiplied together. What number am I?
Answer: 0

Riddle: I am a mystery number. If you multiply me by myself and add 9, the result is 25. What number am I?
Answer: 4

Number Riddles For Adults

Riddle: I am a two-digit number. When you reverse me, I become 27 more than I was before. What number am I?
Answer: 36

Riddle: I am a prime number between 50 and 70. If you reverse my digits you get another prime. What number am I?
Answer: 61

Riddle: Three people share a $30 bill equally. The waiter gives them $5 back, and they each keep $1, giving $2 as a tip. Now they paid $27 total and the waiter kept $2 — where is the missing $1?
Answer: There is no missing dollar — the $2 tip is part of the $27 total.

Riddle: I am a number. When you multiply me by 3 then subtract 5, you get the same result as when you add 7 to me. What number am I?
Answer: 6

Riddle: A clock shows the time as 2:20. How many degrees are between the hour and minute hands?
Answer: 50 degrees

Riddle: I am a four-digit number. If you remove my first digit, the new number is one-ninth of the original. What number am I?
Answer: 1111

Riddle: I am thinking of a number. Twice the number plus 4 equals three times the number minus 5. What is the number?
Answer: 9

Riddle: You have two ropes that each burn in exactly one hour but not at a steady rate. How can you measure exactly 45 minutes?
Answer: Light one rope at both ends and the other at one end. When the first burns out (30 minutes), light the other end of the second rope — it will burn for 15 more minutes.

Riddle: I am a three-digit number. The hundreds digit is the sum of the other two digits, and the number is 3 times the sum of its digits. What number am I?
Answer: 144

Riddle: I am a number that becomes 18 more when my digits are reversed. What number am I?
Answer: 39

Riddle: I am the smallest positive number that is both a perfect square and the sum of two consecutive squares. What number am I?
Answer: 25

Riddle: Five people sit in a row. How many different ways can they sit?
Answer: 120

Riddle: I am a three-digit number. My digits add up to 12. If you reverse me, the new number is 297 more than the original. What number am I?
Answer: 237

Riddle: A container has 100 balls, 10 are red and 90 are blue. You can split them into two boxes any way you like. You pick one box at random and draw one ball. How should you arrange them to have the best chance of drawing a red ball?
Answer: Put 1 red ball in box A, and all remaining balls (9 red + 90 blue) in box B.

Riddle: I am a two-digit number. The sum of my digits is 9, and when reversed, I become 27 greater. What number am I?
Answer: 36

Riddle: A bottle and a cork cost $1.10 in total. The bottle costs $1 more than the cork. How much does the cork cost?
Answer: $0.05

Riddle: I am a number between 1 and 100. I leave remainder 1 when divided by 2, remainder 2 when divided by 3, remainder 3 when divided by 4, and remainder 4 when divided by 5. What number am I?
Answer: 59

Riddle: I am a whole number. If you add me to my square, the result is 72. What number am I?
Answer: 8

Riddle: I am a six-digit number where the first three digits and the last three digits are the same (like abcabc). What is the smallest such number divisible by 7?
Answer: 101101

What Am I Number Riddles