# 28 Math riddles that even your math teacher will fail

Most important 28 math riddles that even your math teacher will fail. All these riddles are very interesting and challenging. If you are good at mathematics you can solve these riddles. How many riddles you can solve, write below the comment section.

## 28 Math riddles that even your math teacher will fail

1. Riddle: How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Answer: It will still be 38°.

2. Riddle: 81 x 9 = 801. What must you do to make the this equation true?

Answer: Turn it upside down.  108 = 6 x 18.

3. 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 take the egg out of the water. You don’t need the four-minute timer for this riddle.

4. Riddle: What two whole, positive numbers that have a one-digit answer when multiplied and a two-digit answer when added?

5. Riddle: What did the triangle say to the circle?

6. 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.

7. Riddle: If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

8. 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)

9. Riddle: What did the little lobster get on its math test?

10. Riddle: How can you make the following equation true by drawing only one straight line: 5+5+5=550? Can you figure it out?

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”.

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

Answer: You can use a cowculator.

12. Riddle: If 4+2=26, 8+1=79 and 6+5=111. Then, what is 7+3?

4+2=26 is because 4-2=2 and 4+2=6,so it is 26. Therefore, 7-3=4 and 7+3=10(410).

13. Riddle: A sphere has three, a circle has two, and a point has zero. What is it?

14. 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?

15. Riddle:

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. Iam twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put togeather.

How old is the man’s son?

16. Riddle: 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?

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

17. Riddle: How do you make the number 7 even without addition, subtraction, multiplication, or division?

18. Riddle: How can you take 2 from 5 and leave 4?

F  I V  E

Remove the 2 letters F and E from five and you have IV.

19. Riddle: Can you write down eight eights so that they add up to one thousand?

Answer: 888 + 88 + 8 + 8 + 8 = 1000.

20. Riddle: 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?

21. Riddle: In a stable there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable?

Answer: 14 horses and 8 men. 14×4 plus 8×2 = 72 feet.

22. Riddle: How many sides does a circle have?

Answer: Two. The inside and the outside.

23. Riddle: How many times can you subtract the number 5 from 25?

Answer: Once, because after you subtract it’s not 25 anymore.

24. Riddle: When John was six years old he hammered a nail into his favorite tree to mark his height. Ten years later at age sixteen, John returned to see how much higher the nail was. If the tree grew by five centimeters each year, how much higher would the nail be?

Answer: The nail would be at the same height since trees grow at their tops.

25. Riddle:

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?

Answer: I am 40 and my daughter is 10.

26. Riddle: There is a clothing store in Bartlesville. The owner has devised 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. The pricing method consists of charging \$5 for each letter required to spell the item.

27. Riddle: What did one math book say to the other math book?