### 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 © 2021

## 16 06 68 Riddle

Hint:

Answer: 87

Explanation:

If you look at the upside down you will see that the series is actually

86, 87, 88, 89, 90, 91

So the answer is 87.

YES NO

Explanation:

If you look at the upside down you will see that the series is actually

86, 87, 88, 89, 90, 91

So the answer is 87.

*Did you answer this riddle correctly?*YES NO

## You Start With 1000 Riddle

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?

Hint:

If you said 5000 you're wrong! The answer is 4100, how?

1000 + 40 = 1040

1040 + 1000 + 30 = 2070

2070 + 1000 + 20 = 3090

3090 + 1000 = 4090

4090 + 10 = 4100

YES NO

1000 + 40 = 1040

1040 + 1000 + 30 = 2070

2070 + 1000 + 20 = 3090

3090 + 1000 = 4090

4090 + 10 = 4100

*Did you answer this riddle correctly?*YES NO

## A Dash At 20 And A Dot At 60

Hint: It's not a clock.

## Find Those Missing Numbers Riddle

In the attached figure, you can find two missing numbers. Can you analyze the pattern and find those missing numbers?

Hint:

The number missing on the left is 8 and the one on right is 7.

Explanation:

The pattern:

The number in the center of triangle is the square root of the sum of the numbers sitting outside on the corners.

Thus,

10 + 22 + 4 = 36

Square Root of 36 = 6

In the same manner:

10 + 42 + 12 = 64

Square Root of 64 = 8

12 + 22 + 15 = 49

Square Root of 49 = 7

YES NO

Explanation:

The pattern:

The number in the center of triangle is the square root of the sum of the numbers sitting outside on the corners.

Thus,

10 + 22 + 4 = 36

Square Root of 36 = 6

In the same manner:

10 + 42 + 12 = 64

Square Root of 64 = 8

12 + 22 + 15 = 49

Square Root of 49 = 7

*Did you answer this riddle correctly?*YES NO

## The Correct Number Riddle

Hint:

121

Explanation

Tables consist of squares of the number from 4 to 12.

11^2 = 121.

YES NO

Explanation

Tables consist of squares of the number from 4 to 12.

11^2 = 121.

*Did you answer this riddle correctly?*YES NO

## 19 And 20 Riddle

Hint:

## Can You Find The Mistake?

Hint: Read carefully.

## My First Half Means Container

Hint:

**Solved: 41%**

## 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

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