Riddles > Math Riddles

The Hourglasses

Welcome to the math riddles section! Here you'll find riddles with answers from all the corners of mathematics to challenge your math skills with.

The Hourglasses
Riddle:
If you have an 11 minute and 13 minute hourglass, how can you accurately time 15 minutes?
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How Many Animals Are Going to the River?
Riddle:
1 duck saw 4 elephants as it was going toward the river. Every elephant noticed 2 monkeys going to the river. Every monkey was carrying 1 dove in its paws. How many animals are going to the river?
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Animals on the Bed
Riddle:
You enter a room and notice a bed. There are 3 dogs, 2 cats, 1 goat, 4 crows, and a goose on the bed. In addition, 3 sparrows are flying around the bed. How many LEGS are there on the floor?
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Son of a Chemist
Riddle:
I am the son of a chemist and a mathematician. People call me iron 59. What is my name?
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Head of a Whale
Riddle:
The head of a whale is six feet long; his tail is as long as his head and half his body, and his body is half of his whole length. How long is the whale?
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How High
Riddle:
How high would you have to count before you would use the letter A in the English language spelling of a whole number?
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Next Number
Riddle:
What is the next number in the sequence? 2, 3, 5, 9, 17, _
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In a Stable
Riddle:
In a stable there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable?
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8 Feet Away
Riddle:
If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?
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If it Takes 5 Microwaves
Riddle:
If it takes 5 microwaves 5 minutes to cook 5 chickens, how long does it take 100 microwaves to cook 100 chickens?
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On My Way...
Riddle:
On my way to St. Ives, I met a man with seven wives. Each wife had seven sacks, Each sack had seven cats, Each cat had seven kits. Kits, cats, sacks, wives, How many were going to St. Ives?
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Land of Make Believe
Riddle:
You are on your way to visit your Grandma, who lives at the end of the valley. It's her anniversary, and you want to give her the cakes you've made. Between your house and her house, you have to cross 5 bridges, and as it goes in the land of make-believe, there is a troll under every bridge! Each troll, quite rightly, insists that you pay a troll toll. Before you can cross their bridge, you have to give them half of the cakes you are carrying, but as they are kind trolls, they each give you back a single cake. How many cakes do you have to leave home with to make sure that you arrive at Grandma's with exactly 2 cakes?
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Finish this sequence top to bottom...
Riddle:
Look at this sequence from top to bottom. What is the next number in the sequence? 1 11 21 1211 111221 312211 ?
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Between 3 and 4
Riddle:
What can you stick between a 3 and a 4 so that the result is more than three but less than four?
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The Wheel and the Spokes
Riddle:
if a wheel has 64 spokes, how many spaces are there between the spokes?
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Reversed Age
Riddle:
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? * There are THREE possible solutions
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Google Riddles - The Surprise Box
Riddle:
You have 3 boxes. One of them contains a prize. You were allowed to pick just one of them. You pick - and it's empty. With 2 boxes left, you now have one box in your hand and another box in front of you. If given the chance to exchange your box with the box in front of you, would you do it? Why, and why not? (The 'Google Riddles' are interview questions those who wish to get hired were asked).
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Google Riddles - The Return Flight
Riddle:
Today is more windy than yesterday, will a return flight take the same time, less time, or the same amount of time to complete? (The 'Google Riddles' are interview questions those who wish to get hired were asked).
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Google Riddles - The Big Hand and the Small Hand
Riddle:
What is the angle between the big hand and the small hand when the time is 3:15? (The 'Google Riddles' are interview questions those who wish to get hired were asked).
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The Julius Caeser Box Riddle
Riddle:
What does this message say? Can you decipher it? G T Y O R J O T E O U I A B G T
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The Word in the Matches
Riddle:
Can you make a word out of these two rows of matches without moving them?
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The Shadows of Graphs
Riddle:
Look carefully at these graphs, can you find the actual height of the red bar?
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The Weight of Soap
Riddle:
We have two soap of equal weights and a 3/4 pound weight. However, after using 1/4 of soap we place all three objects on balance as On one side of balance we place one soap (unused) and on another side, we placed used soap (i.e 3/4th of soap) and 3/4 pound weight. What is the soap weight?
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The Number Pyramid
Riddle:
Can you complete the pyramid by replacing X, Y and "?" with the correct number?
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The 15 Minutes Recipe
Riddle:
A recipe requires 15 minutes to cook. You have a 7 minutes hourglass and an 11 minutes hourglass with you. How will you measure 15 minutes using them?
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Giving Away Vegetable Oil
Riddle:
You are distributing vegetable oil. There are 21 bottles in total out of which 7 are full, 7 half empty and 7 empty. The oils has to be distributed among three people. How will you distribute so that each person gets equal number of bottles and the same quantity of oil?
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The Hard Triangle Riddle
Riddle:
This is a hard one: How many triangles are in this complicated picture?
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How Many Triangles?
Riddle:
How many triangles are in this image?
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The Bracelet and the Sales Tax
Riddle:
Casey buys a bracelet. She pays for the bracelet and pays $0.72 in sales tax. The sales tax rate is 6%. What is the original price of the bracelet, before tax?
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What Makes This Equation True?
Riddle:
If 1+9+8=1, what is 2+8+9?
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