Do you want some math riddles for kids? Here we have gathered many that you can try and tell further to your kids or friends. Some are easy while others are hard and difficult.
How old is the brother?
When Grant was 8, his brother was half his age. Now, Grant is 14. How old is his brother?
Answer: His brother is 10. Half of 8 is 4, so Grant’s brother is 4 years younger. This means when Grant is 14, his brother is still 4 years younger, so he’s 10.
John was 11 the day before yesterday, and next year he’ll turn 14. How is this possible?
Answer: Today is January 1st, and John’s birthday is December 31st. John was 11 the day before yesterday (December 30th), then turned 12 the next day. This year on December 31st he’ll turn 13, so next year he’ll turn 14.
How Many children?
Julie has 5 daughters. Each of these daughters has a brother. How many children does Julie have?
Answer: They have 6 children. Each daughter has the same brother. There are 5 daughters and 1 son.
What 3 numbers give the same result when multiplied and added together?
Answer: 1, 2, and 3 (1 + 2 + 3 = 6 and 1 x 2 x 3 = 6).
Divide 30 by ½ and add 10. What’s the answer?
Answer: It’s 70. You’re dividing 30 by ½, not by two. Thirty divided by ½ is the same thing as multiplying it by two, which is 60. Plus 10 makes 70!
How many sheeps?
A farmer has 19 sheep on his land. One day, a big storm hits and all but seven run away. How many sheep does the farmer have left?
Answer: Seven. The riddle says all but seven run away, meaning there are seven left who didn’t.
Your sock drawer only contains 18 white socks and 18 blue socks. How many times do you need to reach inside the drawer and take out a sock to guarantee a matching pair?
Answer: Three times. On the third time, you’ll get either a white or a blue sock to match with one of the other two you’ve already grabbed.
You planted sunflower seeds in your back garden. Every day, the number of flowers doubles. If it takes 52 days for the flowers to fill the garden, how many days would it take for them to fill half the garden?
Answer: It would take 51 days. If the number of flowers doubles every day, half the garden would be full the day before, on the 51st day.
The number 1000
Using only addition, how can you use eight eights to get the number 1,000?
Answer: 888 +88 +8 +8 +8
When Ashley was 15, her mother was 37. Now, her mother is twice her age. How old is Ashley?
Answer: Ashley is 22. Her mother is 22 years older, so when Ashley is 22, she’s now half her mother’s age.
The paint job
Tom was asked to paint the number of plates on 100 apartments which means he will have to paint numbers 1 through 100. Can you figure out the number of times he will have to paint the number 8?
Answer: 20 times. (8, 18, 28, 38, 48, 58, 68, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 98)
If you multiply this number by any other number, the answer will always be the same. What number is this?
How many times can you subtract the number 5 from 25?
Answer: Only once because after you subtract it is not going to be 25 anymore.
The reverse age
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?
Answer: There are three possible solutions for this, the father-son duo could be 51 and 15 years old, 42 and 24 years old or 60 and 06 years old.
There are 6 black socks, 8 brown socks, 4 blue socks, and 2 red socks in my sock drawer. Can you figure out the minimum number of socks to be pulled out in order to get a matching pair for sure?
Answer: At least 5
The coin toss
Robin tosses a coin 10 times and it landed in the heads up position all ten times. So what are the possible chances for him to toss it up again and get landed in heads up position?
Answer: He has a 50% chance to see the heads up position. This is because the coin toss is not dependent on the first 10 tosses.
How much does a cat cost?
The price of a duck is $9, a spider costs $36 and a bee was priced $27.
By taking into account this information, what will be the price of a cat?
Answer: $18 ($4.50 per leg)
Seven boys met each other at a party. Each of them shakes hands only once with each of the other boys. What is the total number of handshakes that took place?
Hard Math Riddles for Kids
The house number
My friend lives at the reverse of my house number. The difference between our house numbers ends in two. What are the lowest possible numbers of our house?
Answer: The lowest possible numbers for our house are 19 and 91.
The apple tree
Mrs. Jones was very proud of her apple tree. One autumn, after harvesting her apples, she called her three sons together. “Here are 150 apples,” she said. “I want you to take them to the market tomorrow and sell them for me.” She gave Paul 15 apples, Nick 50, and Ben 85. “Your job,” added Mrs. Jones, “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?
Answer: The first buyer purchases 12 dozen apples at $1 per dozen. Paul sells him one dozen and has three apples left; Nick sells him four-dozen and has two apples left; and Ben sells him seven-dozen and has one apple left. Then a second buyer comes along and buys all their remaining apples for $3 apiece. The three brothers head home with $10 each.
One brother says of his younger brother: “Two years ago, I was three times as old as my brother was. In three years’ time, I will be twice as old as my brother.” How old are they each now?
Answer: The elder is 17, the younger 7. Two years ago, they were 15 and 5 respectively, and in three years’ time, they will be 20 and 10.
The turtles at the aquarium
Leon works at the aquarium. When he tries to put each turtle in its own tank, he has one turtle too many. But if he puts two turtles per tank, he has on tank too many. How many turtles and how many tanks does Leon have?
Answer: He has 3 tanks and 4 turtles
The speed of the train
A 300 ft. train is traveling 300 ft. per minute must travel through a 300 ft. long tunnel. How long will it take the train to travel through the tunnel?
Answer: Two minutes. It takes the front of the train one minute and the rest of the train will take two minutes to clear the tunnel.
The three-digit number
I am a three-digit number. My second digit is 4 times bigger than the third digit. My first digit is 3 less than my second digit. Who am I?
How many eggs?
Eggs are $0.12 a dozen. How many eggs can you get for a dollar?
Answer: 100 eggs, at one penny each
The odd little town
In an odd little town, there was an odd little stream, WIth odd little fish in an odd little team. A stranger approached a local fisherman, And asked him how much his odd little fish weighed. The odd little man replied: All the fish in this stream weigh exactly 1/2 of a pound plus 1/2 of a fish. Isn’t that odd? How many pounds does an odd little fish weigh?