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

## 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!

rd.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?

## rd.com, Getty Images (2)

Four fish and three tanks.

## Make it work

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

## rd.com, Getty Images

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

## Phone tag

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

## rd.com, Getty Images

Zero. Any number multiplied by zero equals zero.

## 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?

## rd.com, Getty Images

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).

## 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?

## rd.com, Getty Images

\$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.

## Evens and odds

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

## rd.com, Getty Images

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

## Multiply it

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

## rd.com, Getty Images

Zero. Any number multiplied by zero equals zero.

## 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?

## rd.com, Getty Images

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.

## Egg equation

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

## rd.com, Getty Images

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

## 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?

## rd.com, Getty Images (2)

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

## rd.com, Getty Images

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?

## rd.com, Getty Images

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

## Subtraction

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

## rd.com, Getty Images

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

## 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?

## rd.com, Getty Images

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

## 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?

## rd.com, Getty Images (2)

Their aunt is Lindsey’s mom.

## 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?

## rd.com, Getty Images

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).

## Grocery shopping

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

## rd.com, Getty Images

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

## Circular

How many sides does a circle have?

## rd.com, Getty Images

Two: inside and outside.

## rd.com, Getty Images

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?

## rd.com, Getty Images

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

## 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?

## rd.com, Getty Images (2)

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

## Apple math

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

## rd.com, Getty Images (2)

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

## 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?

## rd.com, Getty Images (2)

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!).

## 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?

## rd.com, Getty Images (2)

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.

## 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?

## rd.com, Getty Images (2)

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).

## Number sequence

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

## rd.com, Getty Images

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

## Kids match

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

## rd.com, Getty Images (2)

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

## 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?

## rd.com, Getty Images (2)

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

## Age question

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

## rd.com, Getty Images

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.

## 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?

## rd.com, Getty Images (2)

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

## 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?

## rd.com, Getty Images (2)

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