50 Best Math Brain Teasers for Kids
September 13, 2024
Math brain teasers are puzzles that combine numbers with logical thinking. They may be told as a sort of riddle or as an equation, but their end goal is always the same. Essentially, their function is to encourage attention to detail and the nuance of language. Math brain teasers for kids also help enhance memory and reasoning skills. With practice, over time, students can strengthen their critical and logical thinking skills and can even build their .
Math mind teasers work like games, which can make them more fun than traditional math problems. Plus, these brain teasers can help children foster their problem-solving and creative thinking skills as they continue their education at any level. Unlike math problems found in textbooks, these math mind teasers are focused on exploring numbers and concepts in an interesting, everyday manner.
Below we have assembled a list of 50 math mind teasers for you to test your knowledge! See if you can solve the riddle before reading the answers.
Math Brain Teasers for Kids/Teens
1) What is the maximum number of times you can subtract 5 from 30?
The answer is once. After you subtract 5 from 30, it then becomes 25. So, from that point on, you can no longer subtract from 30.
2) I appear twice in the morning and twice in the evening. I only appear once at night. What am I?
The answer is the letter N.
3) When Jaden was 10, his sister Olivia was half his age. Now, Jaden is 20. How old is Olivia?
The answer is 15. Olivia is five years younger than Jaden. When he was 10, his sister was 5. Now, ten years have passed. 10 + 5 = 15.
4) Which single-digit number appears most frequently between (and including) numbers 1-1000?
The answer is 1.
5) Which weighs more, one pound of feathers or 16 ounces of lead?
One pound is equal to 16 ounces, so both the feathers and the lead weigh the same amount.
List (Continued)
6) I am as light as a feather, but no one can hold me for more than 5 minutes at a time. What am I?
The answer is breath. No one can hold their breath for more than a few minutes at a time.
7) I belong to you, and you need me every day. But other people use me more often than you do. What am I?
The answer is your name.
8) If you multiply this number by any other number, the answer is always the same. What number is it?
The number 0 multiplied by any other number is always 0.
9) If you multiplied all the numbers on a calculator, what would be the answer?
Again, the answer is 0. If you multiplied every number on a calculator, you would have to multiply by 0.
10) Your sock drawer contains 20 pairs of blue socks and 17 pairs of black socks. The light is off, so you can鈥檛 see the color of the socks. How many socks should you grab to make sure you have a matching pair?
The answer is 3 pairs of socks. No matter which 3 you grab, you will pick at least two of the same color.
Math Brain Teasers for Kids & Teens (Continued)
11) What 5-letter word becomes shorter when you add 2 letters?
The word 鈥渟hort鈥 is the answer. When you add two letters, the word becomes 鈥渟horter.鈥
12) A butcher is six feet tall and wears size 9 shoes. What does he weigh?
The answer is meat. A butcher weighs meat.
13) What can you put between the number 6 and the number 7 to make the result greater than 6 but less than 7?
The answer is a decimal. 6.7 is greater than 6 and less than 7.
14) When does 9 + 5 = 2?
If you think about the solution in terms of time. 9:00 + 5 hours = 2:00.
15) Rhodes has 4 daughters. Each of his daughters has 1 brother. How many children does Mr. Rhodes have?
Mr. Rhodes has 5 children. All 4 of his daughters have the same brother.
Math Mind Teasers (Continued)
16) You have two coins that total 30 cents. One of them is not a nickel. What are the two coins?
A quarter and a nickel. Only one of the coins is not a nickel.
17) If there are 6 apples in a bowl, and you take out 4, then how many apples do you have?
The answer is 4. You took out 4 apples, and so you have 4 apples.
18) Two mothers and two daughters each had 1 egg for breakfast. Only 3 total eggs were eaten. How is this possible?
Only three people were present. A grandmother, a mother (the grandmother鈥檚 daughter), and a granddaughter (the mother鈥檚 daughter).
19) Guess this three-digit number. The second digit is four times greater than the third digit. The first digit is less than the second digit. What is the three-digit number?
The number is 141.
Math Brain Teasers for Kids & Teens (Continued)
20) A painter must paint numbers outside of 100 houses, ranging from number 1 to number 100. How many times will she need to paint the number 8?
The answer is 20 times. 8, 18, 28, 38, 48, 58, 68, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88 (two 8鈥檚), 89, 98
21) More 8鈥檚! Using only addition, add 8s together to get the number 1,000.
Add 888 + 88 + 8 + 8 + 8 = 1,000
22) If eggs cost 12 cents per dozen, how many eggs can you buy for $1?
The answer is 100 eggs. If a dozen eggs cost 12 cents, then eggs are 1 cent each. There are 100 cents in one dollar.
23) If you toss up a coin, and it lands on heads 50 times, then what are the chances that it will land on tails the next time you throw?
The answer is 50%. There is still a 50% chance of landing on either heads or tails, no matter how many times the coin is thrown.
24) Clark died at a very old age. However, he only had 26 birthdays. How is this possible?
Mr. Clark was born on February 29 in a leap year.
25) Solve for the pattern.
2 + 2 = 44
3 + 3 = 96
4 + 4 = 168
5 + 5 = 2510
What is 6 + 6?
The answer is 3612. The answer is the number multiplied by itself combined with the number added to itself.
List (Continued)
26) A farmer has 23 sheep in her field. One day, a storm hits and scares the sheep. All but seven run away. How many sheep does she have left?
The answer is seven sheep because the rest of the sheep ran away.
27) What shape has four sides with two sets of equal and opposite sides?
The answer is a rectangle.
28) A chicken was given $2, a spider was given $8, and a bee was given $6. How much money would be given to a dog?
The answer is $4. One dollar for each leg of the animal.
29) People can feel this but never touch it. It can fly a kite or sail a ship. What is it?
The answer is wind.
Math Brain Teasers for Kids & Teens (Continued)
30) How many sides does a circle have?
2! Inside the circle and outside the circle.
31) How do you write 23 by only using the number 2?
Let鈥檚 break it down. 22 + (2/2) = 23. Using the order of operations, numbers inside the parentheses are solved first. So, 22 + 1 = 23.
32) Lily works at a bakery. When she tries to put a cookie into a separate box, she had one cookie too many. When she tries to put two cookies into a box, she had one box too many. How many cookies and boxes does Lily have?
The answer is four cookies and three boxes. One cookie in each box would leave an extra cookie with no box. Two cookies in each box would leave a spare box.
33) If two is company and three is a crowd, what are four and five?
The answer is nine. Four and five together equal nine.
34) How many bricks are needed to complete a brick house?
The answer is one, as you would only need one brick to complete the house.
35) A shirt and a purse cost $110 in total. The shirt costs $100 more than the purse. How much is the shirt?
The answer is $100.
Math Mind Teasers (Continued)
36) An apartment has five floors. Four people live on the ground floor, and each floor has two more people living on it than the previous level. Which floor calls the elevator the most?
The answer is the ground floor. Everyone living on the other floors will still need to enter the building on the ground floor and call the elevator to their floors.
37) You are the bus driver on your daily route. At the first stop, three people enter the bus, and no one leaves. You drive ten miles and pick up two more people, and three people leave the bus. Six miles later at the third stop, you pick up four more people. What is the color of the bus driver鈥檚 eyes?
Since you are the bus driver, the answer is the color of your own eyes.
38) A number is increased by 1 and then multiplied by 2. The result is 10. What is the original number?
Let鈥檚 work backwards. Divide by 10 by 2 to get 5, then subtract 1. The original number was 4.
39) In a family, there are 2 brothers and 1 sister. How many children are there total?
The answer is 3 total children. There are 2 brothers + 1 sister.
Math Brain Teasers for Kids & Teens (Continued)
40) What is the largest number you can write using only two digits 鈥 the number 8 and one other digit of your choice?
The answer is 98.
41) A clock is running 15 minutes slow. The current time displayed is 2:45. What is the actual time?
The correct time is 3:00.
42) If you write all the numbers from 300 to 400, how many times does the number 3 appear?
The number appears 120 times. 100 times in the hundreds place and 20 times in the tens and units places.
43) How many pieces do you have if you cut a cake into three equal pieces and take away two?
You will have the two pieces that you took away.
44) What is the next number in this sequence?
2, 3, 5, 7, 11, 鈥?
The answer is 13. The sequence contains all prime numbers.
List (Continued)
45) If 3 cats can catch 3 mice in 3 minutes, then how long will it take 100 cats to catch 100 mice?
The answer is 3 minutes.
46) You visit a clothing store with a strange way of pricing items. A vest costs $20, socks cost $25, and a tie costs $15. How much would a jacket cost?
Each item costs $5 x the number of letters in the word. So, a jacket would cost $30.
47) How can you make this equation correct? 81 x 9 = 801?
If you turn it upside down, then it will be correct and read 108 = 6 x 18
48) You have 900 ml of juice and several cups which each have a capacity of 100 ml. How many cups will you need to pour the juice evenly into the cups if you want to fill each cup .75 of the way?
The answer is 12 cups.
49) Divide 40 by half and add 20. What is the answer?
Let鈥檚 break it down. 40 / 0.5 + 20 = 80. 80 + 20 = 100. The answer is 100.
50) This one-digit number is less than nine and more than three. It is also one more than the number of sides on a hexagon. What is the number?
The number is seven. A hexagon has 6 sides. So, 1 + 6 = 7.
Math Brain Teasers for Kids 鈥 In Review
Math mind teasers are good way for kids to keep their minds sharp both inside and outside the classroom. However, after all this studying, it鈥檚 important to take a brain break to reset.
Keeping still and focusing for a long period of time requires a lot of patience and attention. Breaking up study time can be helpful for students to prevent them from getting overwhelmed. Plus, taking more consistent breaks can also help students better retain new information.
After these mind teasers, maybe your student also wants to try their hand at other riddles, not associated with math. Riddles also require ingenuity and out-of-the-box thinking to solve, making them another fun way to develop critical thinking skills.
So, try out these math brain teasers yourself and see how you do!
Additional Resources
