### Maths Challenges

Maths Challenge consists of cool math games, which really challenge your logical skills. It is essentially a math playground.

The Universal Mind Reader, for instance, can guess any number that you think of - between 1 and 63: it is a cool math game; it is simple, yet cool enough to be one of the great math games. After showing 6 cards that ask some simple questions, it will guess the number you guess.

In addition, there is a programme to test your algebraic skills in a subtle way. The Versatile Mind Reader just does it, by giving you the opportunity to guess a number between 1 and 20.

There are a few other games that make you think through math; all in all, you will not be disappointed for visiting this page - and playing around with the contents.

#### Invert the Triangle

Turn the **triangle of coins** upside down by dragging the coins - with just **3** moves .

The Code Book: The Secret History of Codes and Code-breaking

#### Guess these ...

#### Number Challenges - fun math

- Use four 9's - once and only once - to make 100.
- Use four 5's - once and only once - to make 100.
- Use four 7's - once and only once - to make 100.
- Use digits 1-9 - once and only once - to make 100.
- Find 1001
^{2}- 999^{2}with just two steps. - Forty five is a peculiar number: you can divide it into four parts, say A, B, C and D, in such a way that A*2 = B/2 = C-2 = D+2. What are A, B, C and D?
- I have written a two-digit number on a piece of paper. It is equal to five times the sum of its two digits. If I add nine to the number, the two digits swap their positions around. What is the number?
- There are 12 boys in a group. If they stand up in a line, in how many ways can they be arranged so that the tallest and the shortest always stand together?

The answers are at the end of the page. Please use them as a last resort.

#### The Universal Mind Reader - prodigy math

#### The Versatile Mind Reader - cooler math games

Think of a number (1-20) - make sure you remember it.

Multiply it by 2; then click this

Divide your answer by 2; then click this

Now, take away your original number from the answer.

#### Guess the number of squares

Move the mouse over the image - after making your effort, of course!

The Man Who Knew Infinity: A Life of the Genius Ramanujan by Kanigel, Robert (1992) Paperback

#### Have a crack at this:

Maths Quest: The Museum of Mysteries

#### 3-digit Puzzle

- Think of a 3-digit number.
- Add the 3 digits and take the answer away from the original number.
- Cross out any digit in the answer, and write down the remaining two in the following box and click the button.

#### Can you decipher the pigeon-code?

David Martin, the man from Surrey, England, found the ‘scroll’ inside a small, red, plastic cylinder, which had been attached to a leg of the bird. Although, only the skeletal remains of the bird are visible, the container has managed to keep the message intact for more than six decades, despite being enveloped in soot and dust in equal proportion.

By strange coincidence, the message consists only of 143 characters –3 more than the length of a Twitter message: there are 27 5-letter words, arranged in 7 rows; the last two words have numbers and a back-stroke.

It has not been deciphered yet; so it is your chance to have a crack at it!

Math Hysteria: Fun and games with mathematics

#### The Challenge Faced by Three Jealous Husbands

They have to cross the stream by boat and only two can go in the boat at any time.

Each of the husbands does not want his wife travel with either of the other men, unless he himself is present, for obvious reasons.

How do they solve this problem amicably and cross the stream by boat?

#### This is the of the calendar in the year 1892. Why is it dubbed as one of the shortest years by some?

#### What is the sum of the number in the *18*^{th} row of this pattern?

^{th}

The Complete Book of Fun Maths: 250 Confidence-boosting Tricks, Tests and Puzzles (The IQ Workout Series)

#### Three Dice Puzzle

Hannah and Sarah in a guessing game Hannah is blindfolded; however, it doesn't stop her from guessing correctly the three numbers on the dice appeared at random, when Sarah answers the series of questions put to her. You can impress the friends too with this simple game - by not necessarily blindfolding them, but by pulling wool over their eyes! Give it a go in the name of maths! Please follow the three simple steps:

- Multiply the first number by 2 and add 5.
- Multiply the result by 5 and add the second number.
- Multiply the result by 10 and add the third number.
- Take away 250 from the result.
- The answer has the three numbers on the dice.

5-Minute Math Problem of the Day: 250 Fun, Multi-Step Problems That Sharpen Math Reasoning, Number Sense, and Computation Skills

#### Word Math

#### Statistics Collector's Puzzle

An intelligent, but reserved, statistics collector was in the middle of collecting data of the **ages** of inhabitants in each household in a certain neighbourhood, asking straightforward questions while anticipating the answers in kind.

When she came to a certain house, he found three of the inhabitants were not at home except for a lady who was supposed to look after the place.

"What is the **product of the ages ** of the three people?" asked the data collector.

"1296," replied the woman.

"What's the **sum of their ages**?" asked the young woman, then.

"I can't figure it out, though," said the data collector in frustration.

"Are any of them older than you?" the data collector continued his questioning."No," replied the old woman.

"That's all I need," said the clever statistician.

What are the ages of the three inhabitants in question?

#### Are you Einstein material?

Click this to open up the IQ Test

Answers for Number Challenges - - move the mouse here

1) 99 9/9

2) (5+5)7/0.7(5+5)

3) 7/0.7 * 7/0.7

4) 6 x 9 - 7 x 8 + 3 + 4 x 25 - 1

5) 4000

6) A = 5, B = 20, C = 12, D = 8

7) 45

8) 2*11!

Answer to Statistics Collector's Puzzle - move the mouse over here: 1,18,72