# MATH BRAIN TEASERS

### Fun Facts (Hints)

Mathematics has an extensive history in just about every culture or civilized society known to man. Listed below are some cool facts to get those math juices flowing:
• In 1852 mathematician JJ Sylvester established the "theory of algebraic invariants."
• In 1995 math great Andrew Wiles, proved "Fermat's Last Theorem."
• The first decimal number system is said to have been invented in Ancient Egypt around 5000BC.
• The Ancient Mayan civilization located in Central America is one of the only cultures in the recorded history of the world to use a place-value number system.
• The American Mathematical Society was formed in the late months of 1888 in New York.
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## Bat And Ball Riddle

Hint: The answer isn't 10 cents.
Here's the solution:

Although \$1.00 + \$0.10 does equal \$1.10, if you take \$1.00 \$0.10 you get \$0.90, but the problem requires that the bat costs \$1 more than the ball.

So, the ball must cost \$0.05, and the bat must cost \$1.05 since \$1.05 + \$0.05 = \$1.10

---

Still not convinced? You can use algebra to solve the problem:

First, lets set up the equation:

x + (\$1.00 + x) = \$1.10

\$1.00 + 2x = \$1.10

2x = \$1.10 \$1.00

2x = \$0.101

Finally, solve for x:

x = \$0.05

x + (\$1.00 + x) = \$1.10, so

\$0.05 + (\$1.00 + \$0.05) = \$1.10
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## At The Hardware Store Riddle

Hint:
Prices quoted were for house numbers at 12 cents per number. A number'6' cost me 12 cents.
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Solved: 42%

## Magic Word Riddle

Hint: Count the letters. The number of letters in each individual word make up an important number.
Pi (number of letters in each word of the riddle)
3,1 4 1 5 9
2 6 5 3 5 8
9 7 9
3 2 3 8 4 6
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## Combination Value Riddle

Hint:
A = 1
B = 7
C = 4
D = 16
E = 14
F = 5
G = 9
H = 21
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Solved: 64%

## Running Hot And Cold

Hint:
Blood
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Solved: 56%

## Subtracting 10 From 100 Riddle

Hint:
Once. Next time you would be subtracting 10 from 90.
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## Flying Superman Riddle

Hint:
17.083333 minutes!
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Solved: 25%

## 17 Sheep Riddle

Hint:
9. If all but 9 died, there are 9 remaining live sheep.
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Solved: 73%

## The Non Digital Clock Riddle

Hint:
The hour hand will have moved one-fourth of an hour; therefore, there will be 7.5 degrees between the two hands.
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Solved: 55%

## 150 Pens Riddle

Hint:
She has misplaced 119 pens in total.
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Solved: 51%

## The Jug Full Of Beer

Hint:
First fill the 8 liters jug complete - 4, 8, 0
Fill the 5 liters jug with 8 liters jug - 4, 3, 5
Pour back the beer from 5 liters jug to 12 liters jug - 9, 3, 0
Pour the 3 liters from 8 liters jug to 5 liters jug - 9, 0, 3
Fill the 8 liters jug completely from 12 liters jug - 1, 8, 3
Fill the 5 liters jug from the 8 liters jug - 1, 6, 5
Pour the entire 5 liters jug back in 12 liters jug - 6, 6, 0

You have successfully split the beer into two equal parts.
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## A Large Box Of Money Riddle

Hint:
Just one, after which it will no longer be empty.
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## Filling Your Buckets Riddle

Hint:
Fill the 5 gallon bucket all the way up. Pour it into the 3 gallon bucket until it is full. Empty the 3 gallon bucket. Pour the remaining 2 gallons into the 3 gallon bucket. Fill the 5 gallon bucket all the way up. Finish filling the 3 gallon bucket.
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Solved: 44%

## Feet In A Yard Riddle

Hint:
3.
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Solved: 60%

## Making Ten Riddle

Hint:
Yes it is possible in Roman Numerals. In Roman Numerals,
9 = IX
10 = X
11 = XI

Thus by removing one from 9, you are getting 10 and by removing one from 11, you are getting 10 again.
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Solved: 49%

## Post Your Math Brain Teasers Below

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