# Fun math brain teasers for kids

Math brain teasers are tasks for kids and adults that can develop math and logical thinking. They are very good for primary and secondary school children as they can make kids and teenagers interested in math content and inspire them to look at mathematics outside of school lessons and tests. Even if your child gets bored with traditional math tasks, such brain teasers can be a fun game and help all the family have fun at home, on the road, or in public places without any expensive toys, gadgets, or entertainment.

Math brain teasers are good for developing attention to detail, which is important not only in maths but also in language learning and everyday life.

## 40 math brain teasers for kids with answers

**1**. I belong to you, and you need me every day. But other people use me more often than you do. Guess who I am?

**Answer**: A name.

**2**. People can feel me but never touch me. I can sail your ship or fly your kite. Who am I?

**Answer**: The wind.

**3**. I come twice in the morning and evening but only once at night. Guess who I am?

**Answer**: The letter N.

**4**. You have 900 ml of juice in a bottle, and each cup has a capacity of 100 ml. How many cups will you need to pour the juice evenly in all the cups, filling 0.75 of each cup?

**Answer**: 12.

**5**. Arrange the letters V, L, E, E, L into a word that can be read the same backward and forward?

**Answer**: Level.

**6**. A businessman has 2 cars, 3 scooters, and 5 bicycles. 4 people can be adjusted in a car, 2 people can be adjusted in a scooter, and 1 person can be adjusted on a bicycle. Each tire costs $30, and you have $300. How many people can you transport?

**Answer**: 10.

**7**. Divide 40 by a half and add 20. What’s the answer?

**Answer**: 100 (40 / 0,5 + 20 = 80 + 20 = 100).

**8**. A salesman at the butcher shop is six feet tall and wears size 10 shoes. What does he weigh?

**Answer**: Meat.

**9**. A farmer has 19 cows. One day, a heavy storm hits, and all but nine run away. How many cows does the farmer have left?

**Answer**: 9.

**10**. When Alice was 15, her father was 37. Now, her father is twice her age. How old is Alice?

**Answer**: 22.

**11**. If 7 turns into 13 and 11 turns into 21, then what does 16 become?

**Answer**: 31.

**12**. When Mike was 3, his uncle was able to vote for the first time. Now Mike is half of his uncle’s age. How old are both of them?

**Answer**: Mike is 15, and his uncle is 30.

**13**. How do you write 23 using only the number 2?

**Answer**: 22+2/2=23

**14**. A hen was given $10, a spider was given $40, a bee was given $30. How much would be given to a dog?

**Answer**: $20, $5 for each leg.

**15**. John went to the market and purchased 12 peaches. On his way home, all but 9 got mashed and ruined. How many peaches are left in good condition?

**Answer**: 9.

**16**. If it took 6 men 9 hours to build a barn, how long would it take 12 men to build the same barn?

**Answer**: None, as it would be another barn.

**17**. On an alien planet, half of 10 is 6. If the same proportion is true, then what is one-sixth of 30 on this alien planet?

**Answer**: 6.

**18**. If you multiply this number by any other number, the answer would be the same. What number is this?

**Answer**: 0

**19**. How can you add eight 4s together to get 500?

**Answer**: 444 + 44 + 4 + 4 + 4 = 500

**20**. Mrs. Jones passed away at a very old age after celebrating her birthday for the 26th time in her life. How can this be?

**Answer**: She was born on February 29th of a leap year.

**21**. A father who weighs 200 pounds must cross a river with his son and daughter, each of them weighing 100 pounds. They have one row-boat that can hold only 200 pounds. How do all three of them get across the river?

**Answer**: The son and daughter row across the river. Then the son takes the boat back to the father. The father rows across alone. Then the daughter rows across the river to pick up her brother, and they come together.

**22**. Write a true statement using the numbers 2, 3, 4, and 5 and the symbols + and =. You should use each number and symbol only once.

**Answer**: 3 ^ 2 = 4+5.

**23**. There are twelve kids in a room. Six kids are wearing socks, and 4 are wearing shoes. Three kids are wearing both. How many are barefoot?

**Answer**: 5.

**24**. There are 25 yellow balls, 47 red balls, and 3 blue balls in a box. How many balls does the blind person have to pick to make sure that there are at least 2 balls of different colors?

**Answer**: 48 balls.

**25**. This is a number with a couple of friends, quarter a dozen, and you’ll find it again. What is it?

**Answer**: 3.

**26**. James was asked about his age. He said, “In 2 years, I will be twice as old as I was 5 years ago.” How old is James?

**Answer**: 12

**27**. In a valley, there are some flowers with some butterflies hovering over them. How many flowers and butterflies are there if both the following statements are true:

- If each butterfly sits on a flower, one butterfly won’t get a flower.
- If two butterflies share each flower, there is one flower left out.

**Answer**: 3 flowers and 2 butterflies.

**28**. There are several statues on a shelf. If one statue is the 4th from the left and the 6th from the right, how many statues are on the shelf?

**Answer**: 9.

**29**. How much 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

**Answer**: 100.

**30**. When Bill was nine years old, he hammered a nail into his favorite tree to mark how tall he was. When Bill reached eighteen, he returned to see how much higher the nail was. If the tree grew by ten inches each year, how much higher would the nail be?

**Answer**: The nail is at the same level as trees grow from the top.

**31**. How can you make the statement true by drawing only one straight line: 5+5+5=550=?

**Answer**: There are two different ways to do so. You can either draw a line on the first plus sign to turn it into a 4 (545+5=550) or change the equal symbol to a crossed-out equal symbol which means "not equal to".

**32**. What number would you get when you multiply all of the numbers on a calculator?

**Answer**: 0.

**33**. How many bricks are needed to complete a brick house?

**Answer**: 1, as only the last brick makes the building complete.

**34**. How can you take 2 from 5 to get 4?

**Answer**: Remove the letters F and E from the word FIVE, and you would get the Roman number IV.

**35**. If there are 5 oranges and you take away 3 of them, how many do you have?

**Answer**: 3 oranges, the ones that you took.

**36**. A bag and a pocket cost $110 in total. The bag costs $100 more than the pocket. How much is the bag?

**Answer**: $100.

**37**. Lucius was born on January 1st, 23 B.C and passed away on January 2nd, 23 A.D. What was his age when he died?

**Answer**: 45, as there was no 0 year A.D.

**38**. One 1+9+8=1, then what can be 2+8+9?

**Answer**: Ten (T+E+N, as 1+9+8=O+N+E).

**39**. The sum of the ages of a father and son is 66. The father’s age is the son’s age reversed. How old are they if it is known that the son is a teenager?

**Answer**: the father is 51, and the son is 15.

**40**. If you had six apples and two pears in one hand and two pears and five apples in the other hand, what would you have?

**Answer**: Giant hands.

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