Hey! I know how tricky number puzzles can get, and I was struggling the other day trying to find some challenging ones myself.
That’s when I realized I needed Number Riddles with Answers for Adults that are both fun and brain teasing.
I know how frustrating it can be when you want a good challenge but keep hitting riddles that are either too easy or unclear.
So, I searched and curated a collection of Number Riddles with Answers for Adults that actually make you think and I handled it by testing each one myself to make sure they’re perfect for anyone who loves numbers and logic.
Let’s dive in!
Easy Number Riddles for Adults
- I am a number less than 10, but when you multiply me by 3, the result is still less than 20.
Answer: 6 - I am an odd number. Take away one letter, and I become even.
Answer: Seven - If two’s company and three’s a crowd, what is four and five?
Answer: Nine - I am a number you get when you divide 100 by half of 50.
Answer: 4 - I am the only number that, when spelled out, has letters in alphabetical order.
Answer: Forty - I am a number that is double the sum of my digits.
Answer: 18 - I am a three-digit number. My tens digit is five more than my ones digit, and my hundreds digit is eight less than my tens digit.
Answer: 194 - The more you take away from me, the bigger I get.
Answer: Hole (Trick riddle) - I am a number between 20 and 30, divisible by 2 and 3.
Answer: 24 - If you add me to myself and then multiply by 4, you get 48.
Answer: 6 - I am a number, but when you multiply me by myself, I become positive even if I am negative.
Answer: Any negative number - I am a number that is the same forwards and backwards.
Answer: 121 - I am a number that is the sum of the first three prime numbers.
Answer: 10 - Multiply me by any number, and the sum of the digits of the product will always be the same.
Answer: 9 - I am the smallest two digit prime number.
Answer: 11
Medium Number Riddles for Adults
- I am a number that is three times the sum of my digits.
Answer: 27 - If you subtract me from 50, the result is equal to my half.
Answer: 33.33 - I am a two-digit number. My digits add up to 9, and the number is divisible by 3.
Answer: 36 - I am a number that equals the sum of the squares of my digits.
Answer: 9 - I am a number between 50 and 60, divisible by both 5 and 6.
Answer: 60 - I am a two-digit number. If you reverse my digits and add the original number, you get 99.
Answer: 45 - I am a number. My cube is equal to the sum of my square and twice my number.
Answer: 2 - Multiply me by 2, add 10, divide by 2, and subtract 5, and you get me again.
Answer: 0 - I am a number whose square is equal to the sum of squares of two consecutive numbers.
Answer: 5 - I am a number that is 6 more than my half.
Answer: 12 - My tens digit is three times my ones digit, and the number is less than 50.
Answer: 21 - I am a number between 10 and 20, divisible by both 2 and 5.
Answer: 10 - I am a number whose sum of digits is 6, and when multiplied by 3, the digits sum to 9.
Answer: 24 - I am a prime number between 30 and 50.
Answer: 37 - I am a number that, when squared, gives a result ending with the same digit.
Answer: 5
Hard Number Riddles for Adults
- I am a number between 100 and 200. When divided by 7, the remainder is 4.
Answer: 111 - I am a three-digit number. My hundreds digit is double my ones digit, and my tens digit is three times my ones digit.
Answer: 312 - I am a number that is equal to the sum of factorials of my digits.
Answer: 145 - I am a number that is both a square and a cube.
Answer: 64 - I am a number. Multiply me by 4, add 9, and divide by 5. You get 13.
Answer: 16 - I am a number. When added to my square, the result is 72.
Answer: 8 - I am a number that is a palindrome and divisible by 11.
Answer: 121 - I am a prime number whose digits sum up to 10.
Answer: 19 - I am a number that is 3 less than twice my reverse.
Answer: 21 - I am a number that, when subtracted from 100, leaves a square number.
Answer: 75 - I am a number between 1 and 100 that is divisible by 4 and 6.
Answer: 12 - I am a two-digit number. If you multiply me by 9, the sum of my digits is 9.
Answer: 18 - I am a number that is the sum of the first five prime numbers.
Answer: 28 - I am a number that equals half of my square.
Answer: 2 - I am a number whose square minus 1 is divisible by 8.
Answer: 3
Odd Number Riddles for Adults
- I am an odd number between 10 and 20.
Answer: 13 - I am a number whose square is odd.
Answer: Any odd number - I am a two-digit number. My digits are odd, and their sum is 12.
Answer: 57 - I am an odd number that becomes even if you remove one letter.
Answer: Seven - I am an odd prime number.
Answer: 3 - I am an odd number greater than 50 but less than 60.
Answer: 51 - I am a two-digit odd number, divisible by 3.
Answer: 15 - I am a number whose square plus one is even.
Answer: Any odd number - I am an odd number that is a palindrome.
Answer: 121 - I am an odd number between 1 and 10 that is prime.
Answer: 3 - I am an odd number. My reverse is greater than me.
Answer: 13 - I am a single-digit odd number. Multiply me by 3, and you get a multiple of 9.
Answer: 3 - I am a two-digit odd number whose digits are consecutive.
Answer: 23 - I am an odd number whose cube is less than 50.
Answer: 3 - I am an odd number, and when you double me, the result is even.
Answer: Any odd number
Even Number Riddles for Adults
- I am an even number between 20 and 40.
Answer: 28 - I am a number that is divisible by 2 and 5.
Answer: 10 - I am a number whose digits add up to an even number.
Answer: 44 - I am a two-digit number, both digits even, and divisible by 4.
Answer: 24 - I am a number that is double a prime number.
Answer: 14 - I am a number between 50 and 100, divisible by 8.
Answer: 64 - I am an even number whose square ends with 6.
Answer: 4 - I am a number divisible by 2, 3, and 4.
Answer: 12 - I am an even palindrome.
Answer: 44 - I am a number, double of which is 36.
Answer: 18 - I am a number that is 10 more than half of 60.
Answer: 40 - I am an even prime number.
Answer: 2 - I am a two-digit number where both digits are even and sum to 10.
Answer: 46 - I am an even number whose half is odd.
Answer: 2 - I am an even number divisible by 6 but not by 3.
Answer: Trick: None
Logic Number Riddles for Adults
- I am a number. Multiply me by 5 and add 2 to get 27.
Answer: 5 - I am a number that is three times smaller than 45.
Answer: 15 - I am a number. My double minus 6 equals 12.
Answer: 9 - I am a number between 1 and 50 divisible by 7.
Answer: 7, 14, 21, 28, 35, 42, 49 - I am a number. Add 5 to me, and the result equals my triple.
Answer: 2.5 - I am a number that is equal to 1 less than twice me.
Answer: 1 - I am a number divisible by 9, whose digits sum to 9.
Answer: 9, 18, 27, etc. - I am a number. If you multiply me by 6 and subtract 12, you get 0.
Answer: 2 - I am a number between 10 and 30 divisible by 4 and odd.
Answer: Trick: None - I am a number whose square plus 8 equals 17.
Answer: 3 - I am a number. Divide me by 2, then subtract 4, and you get 1.
Answer: 10 - I am a number. Multiply me by 3 and subtract 9 to get 12.
Answer: 7 - I am a number whose digits add up to 7 and multiply to 12.
Answer: 34 - I am a number between 1 and 20 that is prime and even.
Answer: 2 - I am a number. If you subtract 6 from me, the result is half of me.
Answer: 12
Math Puzzle Riddles for Adults
- I am a number. Multiply me by 4 and subtract 8 to get 12.
Answer: 5 - I am a number whose square minus 4 equals 21.
Answer: 5 - I am a number divisible by 3 and 5, less than 50.
Answer: 15, 30, 45 - I am a number whose digits sum to 10 and multiply to 21.
Answer: 37 - I am a number that is half of 50 minus 5.
Answer: 20 - I am a number. Add 7 to me to get twice my value.
Answer: 7 - I am a number that equals my half plus 9.
Answer: 18 - I am a number divisible by 2, 3, 4, and 6.
Answer: 12 - I am a number. Subtract 9 from me and get half of me.
Answer: 18 - I am a number whose square is less than 50 but greater than 25.
Answer: 6, 7 - I am a number. Multiply me by 7 and subtract 5 to get 16.
Answer: 3 - I am a number divisible by 8 and 4.
Answer: 8, 16, 24, 32, 40, etc. - I am a number whose double plus 6 equals 20.
Answer: 7 - I am a number. Add 12 to me, then subtract 4, and get 16.
Answer: 8 - I am a number that is a cube of 3.
Answer: 27
Tricky Number Riddles for Adults
- I am a number. Multiply me by 5, subtract 3, and the result is 32.
Answer: 7 - I am a number. Add 8 to me, then divide by 2, and the result is 10.
Answer: 12 - I am a number. When you triple me and subtract 7, you get 20.
Answer: 9 - I am a number between 1 and 50 that is divisible by both 4 and 6.
Answer: 12, 24, 36, 48 - I am a number whose square plus 9 equals 49.
Answer: 7 - I am a number. If you subtract 15 from me, the result is equal to half of me.
Answer: 30 - I am a number. Multiply me by 2, then add 5 to get 19.
Answer: 7 - I am a number between 1 and 100 divisible by 3, but not by 9.
Answer: 3, 6, 12, 15, 18, 21, 24… - I am a number whose digits add up to 9, and when multiplied by 3, the digits sum to 9 again.
Answer: 9 - I am a number that is 8 less than twice my value.
Answer: 8 - I am a number. My square minus 5 equals 20.
Answer: 5 - I am a number. Multiply me by 4, subtract 2, and you get 18.
Answer: 5 - I am a number divisible by 5, 2, and 3, but less than 50.
Answer: 30 - I am a number that equals half of my square plus 1.
Answer: 2 - I am a number. Multiply me by 6 and add 4 to get 40.
Answer: 6
Conclusion
Number riddles are an excellent way to exercise your brain and improve your analytic skills.
The above collection of Number Riddles with Answers for Adults ranges from easy to tricky, offering something for every puzzle lover.
With these riddles, you’ll find yourself thinking more creatively and sharpening your logical reasoning every day.
RiddleBurst.com is all about delivering engaging riddles and brain teasers that entertain, challenge, and inspire readers of every age.
