Share on Facebook

30 Math Riddles for Kids (with Answers) to Test Their Smarts

Put your kids' brains to the test with these fun math problems!

Visual elements of math riddles on blue backgroundrd.com, Getty Images

Number me this

If you’ve already challenged your little ones with these riddles for kids, it’s time to put their minds to the test with these math riddles for kids. Riddles like these are not only fun for them to figure out, but are educational at the same time. Some of these will feel like the word problems they might see in their math books, but others expand on them and make them really think critically.

These math riddles for kids will span capabilities and ages, but they’re a great way to push your child to learn more and advance their thinking. And if they master this list, they can try our tougher math riddles to really test their knowledge! Get them warmed up with some easy riddles, then dive right in!

Three fish on math riddle 1 flashcardrd.com, Getty Images (2)

Fishy

Mike works at the aquarium. When he tries to put each fish in its own tank, he has one fish too many. But if he puts two fish per tank, he has one tank too many. How many fish and how many tanks does Mike have?

Four fish; three tanksrd.com, Getty Images (2)

Answer

Four fish and three tanks.

RELATED: 50 Long Riddles to Give Your Brain a Workout

9 +5 = ? on math riddle flashcardrd.com, Getty Images

Make it work

I add five to nine and get two. The answer is correct, but how?

clock with hands pointing to 2 o clockrd.com, Getty Images

Answer

You’re looking at a clock. Move five numbers past the number nine on a clock face and you’re at two.

digits 1 through 0 on math riddle flashcardrd.com, Getty Images

Phone tag

You are given a telephone and asked to multiply all the numbers on the number pad. What’s the answer?

Every digit multiplied, including 0, equals 0rd.com, Getty Images

Answer

Zero. Any number multiplied by zero equals zero.

three slots for digits on math riddle flashcardrd.com, Getty Images

What number am I?

I am a three-digit number. My second digit is six more than my third digit. My first digit is eight less than my second digit. What number am I?

Solution: 193rd.com, Getty Images

Answer

193. The second digit (nine) is six more than the third digit (three) and the first digit (one) is eight less than the second digit (nine).

pants on math riddle flashcardrd.com, Getty Images (2)

Clothing math

A clothing store’s prices are as follows: A vest costs $20, a tie costs $15, a blouse costs $30, and underwear costs $45. How much would pants cost?

vest, tie, blouse, and pants spelled out with each letter representing $5 in costrd.com, Getty Images

Answer

$25. The price is $5 for each letter of the name of the item. Vest = four letters = $20. Tie = three letters = $15. Blouse = six letters = $30. Underwear = nine letters = $45. Pants = five letters = $25.

large "X" surrounded by odd numbers on math riddle flashcardrd.com, Getty Images

Evens and odds

X is an odd number. Take a letter away from X and it becomes even. Which is that number?

the word "seven" with the s whited out to reveal the word "even"rd.com, Getty Images

Answer

Seven. Take away the “S” and it becomes “even.”

4 times x is less than or equal to x times 3 on math riddle flashcardrd.com, Getty Images

Multiply it

Four times what number is no larger than three times that same number?

4 times 0 is less than or equal to 0 times 3rd.com, Getty Images

Answer

Zero. Any number multiplied by zero equals zero.

RELATED: 48 Short Riddles That Will Still Stump You

"multiplied by 2," "multiplied by 4" and "divided by 8" on math riddle flashcardrd.com, Getty Images

Number jumble

Double it and multiply it by four. Then divide it by eight and you’ll have it once more. What number is it?

x times 2 times 4 divided by 8 equals xrd.com, Getty Images

Answer

Any number. If a number is doubled and then multiplied by four, it’s actually being multiplied by eight, so dividing it by eight will get you back where you started.

basket with 3 eggs on math riddle flashcardrd.com, Getty Images

Egg equation

There is an empty basket that is one foot in diameter. How many eggs can be put in this empty basket?

empty basketrd.com, Getty Images

Answer

One. After you’ve put in one egg, it isn’t empty anymore.

three fish on math riddle flashcardrd.com, Getty Images (2)

Something fishy

Two fathers and two sons spent the day fishing but only caught three fish. This was enough for each of them to have one fish. How is this possible?

3 fish labeled "grandfather, father, son"rd.com, Getty Images (2)

Answer

On the boat was a grandfather, father, and son (two fathers and two sons), so each ended up with one fish.

door labeled "66" on math riddle flashcardrd.com, Getty Images

Numbered address

Genevieve was asked to paint the addresses on 100 apartments in numerical order, which means she will have to paint numbers 1 to 100. How many times she will have to paint the number six?

all 20 sixes between 1 and 100rd.com, Getty Images

Answer

20 times. 6, 16, 26, 36, 46, 56, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 76, 86, 96.

RELATED: 42 Tricky “What Am I?” Riddles

Large number 25 with multiple "Minus 5's" floating around on math riddle flashcardrd.com, Getty Images

Subtraction

What is the maximum possible number of times you can subtract the number five from the number 25?

25 minus 5 equals 20rd.com, Getty Images

Answer

Once. After that, you don’t have 25 anymore.

digits four and five separated by a large question mark on math riddle flashcardrd.com, Getty Images

Greater than, less than

What can you put between a four and a five so that the result is greater than a four but less than a five?

4 point 5rd.com, Getty Images

Answer

A decimal. 4.5 is bigger than four but less than five.

three silhouettes represent aunts, cousins, and uncles and their amounts on math riddle flashcardrd.com, Getty Images (2)

Family riddle

Lindsey has a very big family. She has 20 aunts, 20 uncles, and 50 cousins. Each of her cousins has an aunt who is not Lindsey’s aunt. How is this possible?

silhouette of mom/auntrd.com, Getty Images (2)

Answer

Their aunt is Lindsey’s mom.

RELATED: Someone’s Mother Has Four Sons: Try to Solve the Viral Riddle

three slots for digits on math riddle flashcardrd.com, Getty Images

Who am I?

I am a three-digit number. My second digit is four times bigger than the third digit. My first digit is three less than my second digit. Who am I?

solution: 141rd.com, Getty Images

Answer

141. The second digit (four) is four times bigger than the third digit (one) and the first digit (one) is three less than the second digit (four).

Twelve eggs equal sign twelve cents three slots for digits on math riddle flashcardrd.com, Getty Images

Grocery shopping

Eggs are ¢12 a dozen. How many eggs can you get for $1?

12 cents divided by 12 (eggs) is one cent per egg. therefore, 100 eggs is 1 dollarrd.com, Getty Images

Answer

100. If they’re ¢12 for a dozen, they’re a penny each. For $1, you can get 100 eggs.

circle three slots for digits on math riddle flashcardrd.com, Getty Images

Circular

How many sides does a circle have?

circle with 1 labeling inside and 2 labeling outsiderd.com, Getty Images

Answer

Two: inside and outside.

x times y times z = x plus y plus z on math riddle flashcardrd.com, Getty Images

Add and multiply

You are given three numbers. You can add these numbers and multiply them together. The result you get will be the same. What are the numbers?

1+2+3=6, 1x2x3=6rd.com, Getty Images

Answer

One, two, and three. 1 + 2 + 3 = 6 and 1 x 2 x 3 = 6.

RELATED: 8 Genius Brain Boosters You Can Do With Your Kids

Ten coins with heads facing up, one coin with question mark on math riddle flashcardrd.com, Getty Images (2)

Flip a coin

You toss a coin ten times and it landed in the heads-up position all ten times. What are the possible chances for you to toss it up again and have it land in heads-up position?

two coins, heads and tails, labeled "50/50"rd.com, Getty Images (2)

Answer

50 percent. You can’t predict how the coin will land based on previous tosses. The odds will always be 50 percent.

Five apples on math riddle flashcardrd.com, Getty Images (2)

Apple math

There are five apples in the basket and you take away two. How many apples do you have now?

Two applesrd.com, Getty Images (2)

Answer

Two. You took two away and now have those two in your hand.

three silhouettes, one with a question mark hovering over it on math riddle flashcardrd.com, Getty Images (2)

Age-old question

A man is twice as old as his little sister. He is also half as old as their dad. Over a period of 50 years, the age of the sister will become half of their dad’s age. What is the age of the man now?

three silhouettes, labeled 25, 50, and 100rd.com, Getty Images (2)

Answer

50. His little sister is 25 and his dad is 100. In 50 years, the sister would be 75 and the dad would be 150 (if he was still alive!).

notebook x4, pen x4, marker x? on math riddle flashcardrd.com, Getty Images (2)

School supplies

Maggie saved $29 for art supplies. After buying four coloring books for $3 each and four boxes of colored pencils for $2 each, Maggie spends the rest of her money on markers. If markers are ¢50 each, how many markers did Maggie buy?

4 notebooks, 4 pens, and 18 markersrd.com, Getty Images (2)

Answer

18. Four coloring books cost $12 and four boxes of colored pencils cost $8. $12 + $8 = $20. She has $9 left to buy markers, and at ¢50 each, she can buy 18.

two silhouettes with "x?" on math riddle flashcardrd.com, Getty Images (2)

Family equation

A boy has the same number of brothers and sisters. Each sister has half as many sisters as they have brothers. How many brothers and sisters are in the family?

brother silhouette with "x4," sister silhouette with "x3"rd.com, Getty Images (2)

Answer

Four brothers and three sisters. A boy has the same number of brothers and sisters (three and three), and a girl has half as many sisters as brothers (four brothers, two sisters).

RELATED: 25 Brain Teasers for Kids That Will Beat Boredom

"2, 3, 5, 9, 17, _?" on math riddle flashcardrd.com, Getty Images

Number sequence

What is the next number in the sequence: 2, 3, 5, 9, 17?

2, 3, 5, 7, 9, 17, 33rd.com, Getty Images

Answer

33. Each number is double the previous number minus one.

seven children connected to one mother on math riddle flashcardrd.com, Getty Images (2)

Kids match

Eloise has seven daughters and each of them has a brother. How many kids does Eloise have?

8 children silhouettesrd.com, Getty Images (2)

Answer

Eight. Each of the seven daughters has the same one brother.

two people walking with "10 min" between them on math riddle flashcardrd.com, Getty Images (2)

Distance math

Maddie and Joey go to the same school. Maddie left for school ten minutes before Joey. They bump into each other at the park on the way. At the time they meet, who is closest to the school?

two walking silhouettesrd.com, Getty Images (2)

Answer

Neither—they’re in the same place at the same time and equidistant from the school.

two human figures on math riddle flashcardrd.com, Getty Images (2)

Age question

When Sam was ten, his brother was half his age. Now, Sam is 16. How old is his brother?

10 divided by 2 is 5, 16 minus 10 is 6, so 5+6 means the brother is 11rd.com, Getty Images

Answer

11. When Sam was ten, his brother was half his age, which meant he was 5. Sam is now 16 or six years older, so his brother is also six years older. This makes him 11.

12 peaches on math riddle flashcardrd.com, Getty Images (2)

Peachy keen

Bella is shopping and purchases 12 peaches. On the way home, all but nine get mushed and ruined. How many peaches are left in a good condition?

9 peachesrd.com, Getty Images (2)

Answer

Nine. All but nine were mushed, so she has nine left.

seven figure silhouettes on math riddle flashcardrd.com, Getty Images (2)

Brotherly love

There are seven brothers. They were all born two years apart. The youngest brother is seven years old. How old is his oldest brother?

silhouettes labeled 7, 9, 11, 13, 15, 17, and 19rd.com, Getty Images (2)

Answer

19. The brothers are 7, 9, 11, 13, 15, 17, and 19.

eight "4" digits on math riddle flashcardrd.com, Getty Images

Add it up

How can you add eight fours together to get 500?

444+44+4+4+4=500rd.com, Getty Images

Answer

444 + 44 + 4 + 4 + 4 = 500.

Next, test your smarts with these math puzzles—how many can you get right?

Hedy Phillips
Hedy is a freelance writer for places including Best Life, POPSUGAR, InStyle, and more. She devotes 99% of her time to snuggling with her cats and 100% of her money to following Harry Styles around on tour. She's always on the lookout for another slice of New York pizza and she's never met a Starbucks drink she doesn't like.