John has four times the money that Paul has. John gives Paul $33. Paul now has 3 times as much cash as John.

How much money did they each start with?

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## Category: Math Brain Teasers

## John & Paul’s Cash

## Telephone Numbers

## Alphabetical Order

## Same Age

## Special Transaction

## What Does It Equal

## Matters that Count

## Lily Pad Lake

## Frog Escape

## Odd Then Even

## Killer Cats

## Not Nice Number

## Add It Up

## Discounted

## Three Numbers

## Lots of Legs

## Boxes of Balls

## How Many Fingers

## Fool’s Gold

## Coin Confusion

The best math brain teasers to challenge your problem solving skills. How many brain teasers do you think you can answer correctly? Submit your own and challenge your friends.

John has four times the money that Paul has. John gives Paul $33. Paul now has 3 times as much cash as John.

How much money did they each start with?

What number do you get when you multiply all of the numbers found on a telephone’s keypad?

What is the only number whose letters are in alphabetical order?

Jessica just turned 13 years old. Her father Chris is 40 years old.

How many years ago was Chris four times as old as Jessica?

Mark went to a restaurant for dinner last night. When he received his check he paid with a hundred dollar bill.

When the waiter returned his change, Mark received one of every denomination of currency under one hundred dollars.

What was the total cost of Mark’s meal?

If 1 = 5, 2 = 10, 3 = 15, and 4 = 20.

What does 5 equal?

Placed above, I make greater things small. Placed beside I make small things great. In matters that count, I always come first. Where others increase I keep them the same.

What am I?

In a lake, there is a patch of lily pads. Every day, the patch of lily pads doubles in size.

If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half the lake?

A frog falls down a well that is 30 feet deep. Each day he climbs up 2 feet, and each night he falls back down 1 foot. How long does it take him to climb out of the well?

I am an odd number, if toy away one letter then I becomes even.

What number am I?

If 3 cats can kill 3 rats in 3 minutes, how long will it take 100 cats to kill 100 rats?

The numbers One, Two, Three, Four and Five are sitting in a classroom. The number three gets kicked out for his behavior.

What was the number three doing?

How can you add 4 to 10 and get 2 as the answer?

A shopkeeper decides to put all the items on sale for a week for 20% off. A week later he decides to put the items pack to their original prices. What percentage must he now increase the price of the items?

What three numbers can added together or multiplied together and still return the same result?

You walk into a room where there are seven girls. Each girl has seven bags. Inside each bag are seven adult cats. Each adult cat has seven kittens.

Assuming no one is missing any limbs, how many legs are in the room?

There are two boxes, box A and box B. Each box contains several balls.

If you move one ball from box A to box B, box B will then have twice as many balls as box A.

If you move one box from box B to box A, both boxes will then have the same amount of balls.

How many balls are in each box?

Assume there are exactly 7 billion (7,000,000,000) people alive on the planet. What would be the sum if you multiplied together the number of fingers each person had on their left hand?

For this brain teaser, all thumbs count as fingers.

There are five identical looking bags of gold coins. Four of the bags contain coins made of real gold and one of the bags contains coins made of fool’s gold.

All of the coins in all of the bags look identical. They are the same size, color and shape. The only difference is their weight. Real gold coins weigh 10 grams and coins made of fool’s gold weigh 11 grams.

You have an accurate scale that you can use only one time to determine which bag contains the fool’s gold. How do you do it?

You are blindfolded and wearing gloves, on the table in front of you are 100 coins. 90 of the coins are showing heads and 10 of the coins are showing tails. You are unable distinguish which is which by touch or any other method.

You must separate the coins into two groups with an equal amount of coins in each group showing tails. How do you accomplish this?

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