### Fun Facts (Hints)

Math is a part of our lives in almost every way. Check out these interesting facts about math that show why it's the "universal language":
The mathematical tool, the wheel, is believed to be first used around 3000 BC.
3000 BC is also the period in which the Ancient Egyptians started using numerals. As evidenced in their hieroglyphics.
Fahrenheit invented his thermometer in 1718. Thermometers are mathematical tools used to measure temperature, and of course are still used widely present-day.
The first evidence of counting dates back more than 52,000 years and is attributed to the Neanderthal man.
Galileo one of the most famous mathematicians, was born in 1564.

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Riddles and Answers © 2018

Located on this page are some very easy math questions in the form of riddle, and some very thought-provoking math riddles to complete as well. To solve them most advantageously you must read through the problem and try to think about them in as many different ways that you can force your mind to. This is where the mental exercise and brain development starts to kick in!

Think you're ready to take on these challenging math puzzles? The newest problems are at the top, and the solutions to each problem are below the questions.

Also, math buffs remember to check back here frequently for the new and engaging mathematical puzzles we add on a regular basis.

## 19 And 20 Riddle

Hint:

## Can You Find The Mistake?

Hint: Read carefully.

## My First Half Means Container

Hint:

**Solved: 36%**

## David Is 6 Years Old Riddle

Hint:

David: 6

Lauren: 3

David is 3 years older than Lauren.

So when David is 100 Lauren is 97.

Answer: 97

YES NO

Lauren: 3

David is 3 years older than Lauren.

So when David is 100 Lauren is 97.

Answer: 97

*Did you answer this riddle correctly?*YES NO

## 1500 Plus 20 And 1600 Minus 40 Riddle

Hint:

## Counting Time Riddle

Hint:

## Four Times To Infinity

Hint:

## The Prime Number Riddle

Two hundred people in an auditorium are asked to think of a single digit number from 1 to 9 inclusive and write it down. All those who wrote down a prime number are now asked to leave. Ninety people remain behind in the hall. How many of these are expected to have written down an odd number?

Hint: Remember that 1 is not a prime number.

Those that remain behind must have written {1,4,6,8,9} and from this only {1,9} are odd. The probability of an odd number is thus 2/5.

Expected number of odds is 2/5 * 90 = 36

YES NO

Expected number of odds is 2/5 * 90 = 36

*Did you answer this riddle correctly?*YES NO

## 100 Offices Riddle

A new medical building containing 100 offices had just been completed. Mark was hired to paint the numbers 1 to 100 on the doors. How many times will Mark have to paint the number nine?

Hint:

Did you say three? The correct answer is twenty (29, 39, and so on).

YES NO

*Did you answer this riddle correctly?*YES NO

## Dial 666

Hint:

## Post Your Number Riddles Below

Can you come up with a cool, funny or clever Number Riddles of your own? Post it below (without the answer) to see if you can stump our users.