Math Riddles &amp; Number Puzzles

What 3 positive numbers give the same result when multiplied and added together?

There is a chain nailed to the wall. The chain is 10 feet long and the centre of the chain dips down 5 feet from where each side of the chain is nailed to the w...

How can you make the following true by changing a single line? 5+5+5=550

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

If two hours ago, it was as long after one o'clock in the afternoon as it was before one o'clock in the morning, what time would it be now?

How many 9's are there between 1 and 100?

An athlete is able to jump FOREVER. However, every time that she jumps she gets a bit more tired, and every jump goes 1/2 as far as her prior jump. Now, for her...

A person picks up cigarette butts from the ground and can make a cigarette with 4 butts. If he finds 16 cigarette butts, how many cigarettes can he make?

1203=1 4566=2 8898=7 4566=2 5464=1 7774=0 4500=

In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it ta...

If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?

In a certain country ½ of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10 ?

You start with 1000 then add 40 add another 1000 then add 30 add another 1000 then add 20 add one more 1000 then add 10 what is your answer?

Five hundred begins it, five hundred ends it, Five in the middle is seen; First of all figures, the first of all letters, Take up their stations between. Join a...

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.

Jim and Wanda both have some apples. If Jim gives Wanda an apple, they will both have the same number of apples. However, if Wanda gives Jim an apple, Jim will...

It takes 10 minutes to fry one steak -- 5 minutes from each side. Two steaks can fit on a pan. What is the shortest possible time to fry 3 steaks?

Of all the numbers whose literal representations in capital letters consists only of straight line segments (for example, FIVE), only one number has a value equ...

The combined age of Jack and John is 49. Jack is twice as old, as John was when Jack was as old as John is now. How old are the brothers?

You want to hire a temporary employee for one month. You offer him reasonable wages, but the employee suggests an alternative. For the first day of work, he wil...

There are 25 red balls, 47 green balls and 3 blue balls in a basket. There is a blind man. What is the minimum number of balls that the blind man has to pick to...

There are 12 kids in a classroom. 6 kids are wearing socks and 4 are wearing shoes. 3 kids are wearing both. How many are bare feet?

A merchant can place 8 large boxes or 10 small boxes into a carton for shipping. In one shipment, he sent a total of 96 boxes. If there are more large boxes tha...