20 Math Riddles Only The Smartest Can Solve

Maths can be an interesting subject and there are also a lot of activities and games that you can play with maths and riddles are one of the most fun ones. Let’s multiply your fun with easy & hard maths riddles. There are not a lot of things that are better to exercise your brain than maths and riddles. We have mixed both math riddles for kids and adults in these 20 riddles. Let’s see if you can figure all of them or not. The anwsers to all riddles will be listed at the bottom of this article.

1. The number  '7' is the prime followed by a cube. Can you find any other number that shares the same quality?

2. How many sides does a circle have?

3. You know 2 x 2 has the same sum as 2 + 2. Now find a set of three different whole numbers whose sum is equal to their total when multiplied.

4. A small number of cards have been lost from a complete pack. If I deal among four people, three cards remain. If I deal among three people, two remain and if I deal among five people, two cards remain. How many cards are there?

5. A smartphone case and smartphone cost $110 in total. The smartphone costs $100 more than the smartphone case. How much was the smartphone?

6. A 6-digit number whose sum of its digits is 43.

Two of the three statements below about that number are accurate:

(1) the number is under 5,00,000.

(2) it is a square number.

(3) it is a cube number.

7. What did a math book say to another math book?

8. Mr. David was proud of his orange tree. One summer, after harvesting his oranges, he called his three daughters together. “Here are 150 oranges,” he said. “I want you to take them to the market tomorrow and sell them for me.” He gave Marie 15 apples, Claire 50, and Emma 85. “Your job,” added Mr. David, “is to sell the apples in such a way that each of you brings home the same amount of money.” How do they do it?

9. A spider was given $36, a bee was given $27, and a duck was given $9, Based on this information, how much money would a dog be given?

10. A grandmother, two mothers, and two daughters went to a baseball game together and bought one ticket each. How many tickets did they buy in total?    

11. Why is it easier to count cows than sheep?

12. Old Grandpa James left half his money to his grandson and half that amount to his granddaughter. He left a sixth to his sister, and the remainder, $1,000, to the dogs’ home. How much did he leave altogether?

13. In a certain country ½ of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10?

14. If a hen and a half lay an egg and a half in a day and a half, how many eggs will half a dozen hens lay in half a dozen days?

15. If a zookeeper had 100 pairs of animals in his zoo and if two pairs of babies are born for each and every one of the original animals, and then sadly 23 of them don’t survive, how many animals does he have left in total?

16. The total cost of a new pair of sunglasses and a new pair of headphones is $140. The sunglasses cost $100 more than the headphones. How much do the sunglasses cost?    

17. How far can a cat run into the woods?    

18. One is to three as three is to five and five is to four and four is the magic number.

What is the pattern?

19. If you are 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?

20. My twin lives at the reverse of my house number. The difference between our house numbers ends in two. What are the lowest possible numbers for our house?

Answers:

1.  No, there is none.

Explanation: 7 is the only prime followed by a cube.

Assume that n3-1 is a prime for some n.

N3-1 will be equal to (n−1)(n2+n+1)

Now, n-1 divides n3-1.

If n-1>1, then we will have a contradiction to n3-1 being a prime.

2.  Two. The outside and the inside.

3.  The answer is 1, 2, and 3.

4. There are 47 cards.

5. $105 

6. The number is 499849, which means only the 1 & 2 statements are true.

Explanation: 7,072 = 4,99,849

4,99,849 < 5,00,000

7. Do you want to hear about my problems?

8. The first buyer purchases 12 dozen oranges at $1 per dozen. Marie sells her one dozen and has three oranges left; Claire sells her four-dozen and has two oranges left, and Emma sells her seven-dozen and has one orange left. Then a second buyer comes along and buys all their remaining oranges for $3 a piece. The three sisters head home with $10 each.

9. $18 ($4.50 per leg)

10. 3 tickets (the grandmother is also a mother and the mother is also a daughter)

11. You can use a cowculator.

12. He left $12,000. One half plus one quarter plus one-sixth equals eleven-twelfths. So, the remainder, $1,000, is one-twelfth of the whole, which must have been $12,000.

13. 

14. Two dozen. If you increase both the number of hens and the amount of time available four-fold, the number of eggs increases 16 times. 16 x 1.5 = 24

15. 977 animal (100 x 2 = 200; 200 + 800 = 1000; 1000 – 23 = 977)

16. The sunglasses cost $120 and the headphones cost $20.

17. Halfway (after that, the cat would be running out of the woods)

18. 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).

19. Infinity! Technically you will never reach the door, as you can only move half the distance, no matter how small.

20. The lowest possible numbers for our house are 19 and 91. 

So, how many riddles could you figure out and how long did it take you to answer all of them? We hope these riddles can help you get a bit of fun. We will come back with more fun and interesting riddles for you to solve. In the meantime, there are a lot of interesting articles about maths that you can check out on our site.