11. 12,345,678,987,654,321 is the product of 111,111,111 x 111,111,111. Notice the sequence of the numbers 1 to 9 and back to 1. 

12. Have you ever noticed that the opposite sides a die always add up to seven (7) 

13. Trigonometry is the study of the relationship between the angles of triangles and their sides 

14. Abacus is considered the origin of the calculator 

15. Here is an interesting trick to check divisibility of any number by number 3.A number is divisible by three if the sum of its digits is divisible by three (3) 

16. Do you know the magic of no. nine (9)? Multiply any number with nine (9 ) and then sum all individual digits of the result (product) to make it single digit, the sum of all these individual digits would always be nine (9). 

17. If you add up the numbers 1-100 consecutively (1+2+3+4+5...) the total is 5050 

18. A 'jiffy' is an actual unit of time for 1/100th of a second 

19. Have you heard about a Palindrome Number? It is a number that reads the same backwards and forward, e.g. 12421 

20. Have you heard about Fibonacci? It is the sequence of numbers wherein a number is the result of adding the two numbers before it! Here is an example: 1, 1, 2, 3, 5, 8, 13, 21, 34, and so on 

10! seconds is exactly 6 weeks.

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10! means 10 factorial. 10! = 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 3628800 seconds. Which is 42 days, or 6 weeks, exactly.

22. Take any four digit number, follow these steps, and you'll end up with 6174.

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1. Choose a four digit number (the only condition is that it has at least two different digits).

2. Arrange the digits of the four digit number in descending then ascending order.

3. Subtract the smaller number from the bigger one.

4. Repeat.

Eventually you'll end up at 6174, which is known as Kaprekar's constant. If you then repeat the process you'll just keep getting 6174 over and over again.

23. 555 is used by some in Thailand as slang for "hahaha", because the word for "five" is pronounced "ha".

TO MAKE OUR POINT, LET'S CHECK OUT A FEW INTERESTING FACTS ABOUT MATHEMATICS:

1. GOOGLE IS ALL ABOUT MATHEMATICS

The lifeline of today's time, Google, derived its name from the word 'googol' -- a mathematical term for the number 1 followed by 100 zeros, which reflect infinite amount of search on the internet.

2. CRAZY MULTIPLICATIONS

A very interesting things about math is how crazy it gets with its function. For instance, if you multiply 111,111,111 by 111,111,111, this becomes equal to 12,345,678,987,654,321.

3. THE TERMINOLOGY DILEMMA

This debate is going on for a long time now. But the answer depends on which part of the world you are in. Americans called mathematics 'math', saying that the function of the same is a singular noun and with that logic, they prefer saying 'math', which is singular too. On the other hand, speakers of British English would always say 'maths', as in 'I have a degree in maths'.

However, there are logical arguments for both the spellings. The Oxford and the Merriam-Webster dictionaries say the word is plural because of the letter 's' in the end. On the contrary however, it is usually used as a singular noun. For example, 'Mathematics is my favourite subject' and not 'Mathematics are my favourite subject'.

Other plural nouns that are used as if they were singular are economics, ethics, politics, gymnastics, measles and dominoes. These words, however, are not habitually shortened, making math/maths rather an unusual word.

4. DREADFULLY LONG DIVISION

Another mind-boggling application of maths comes in when the number 1 is divided by 998,001. The answer would give you a complete sequence from 000 to 999 in order. Don't agree with us? Go ahead and try it, and be ready to waste one entire notebook!

5. PIZZA AND MATH: ARE THEY RELATED?

We may seem like someone who is ruining pizza for you but you will be amazed to know its relation with maths. To find out the volume of the cylindrical shape of the pizza, the formula used is Pi x r² x h.

So, if an ordinary pizza has a radius of 'z' and height 'a', its volume is Pi x z x z x a which makes up 'pizza'.

6. MAGICAL DIGIT!

The number 9 is believed to be a magical number with certain very interesting properties. This is because if you multiply a number with 9, and add all the digits of the resulting number, the sum would always come out to be 9.

7. ZERO IS NOT THERE IN ROMAN NUMERALS

Did you know that one of the most important numbers, zero, is not represented in the Roman numerals? Derived from the Arabic word, 'sifr', it is known from a variety of other names like naught, zip, nil and zilch.

8. DID SHAKESPEARE TOO HAVE ISSUES WITH MATHS?

No don't get us wrong, Shakespeare was a literature lover and not a math lover, but the only time he included the word 'mathematics' was in his play, The Taming of the Shrew.

9. WHAT COMES AFTER A MILLION?

After a million comes--- billion, trillion, quadrillion, quintillion, sextillion, septillion, octillion, nonillion, decillion, and undecillion.

10. THE GROWTH OF OUR MATHEMATICAL KNOWLEDGE

In 1900, all the world's mathematical knowledge could be written in 80 books; today it would fill more than 1,00,000 books.

Finger magic

• For 9 tables, keep the ten fingers of your hands open. 
• For 1x9, close the thumb finger of one hand, you could see 9 fingers. So, the answer is 9.
• For 2x9, close the index finger of one hand. You could see 1 before the closed finger and 8 after that. So the answer is 18.
• For 3x9, close the middle finger of one hand. You could see 2 before the closed finger and 7 other fingers after it. So, the answer is 27.

This method will work till 9x9!

Mersal Mathematics: 5 Shortcuts for Multiplication!

Reverse of numbers

Write down vertically the numbers from 0 to 9 in ascending order. Besides that, write down the numbers 9 to 0 in descending order. Once you finish it, surprise! You will get the answer for 9 tables!

09
18
27
36
45
54
63
72
81
90

Also Read: DIY Ideas to Create a Study Nest For Your Kids

Simple Subtraction

For 99 tables, you could use 100 tables. Here's how:

• Say 56 x 99 is the question.
• Multiply 56x100. The answer is 5600.
• Subtract 5600-56. The answer is 5544, which is 56x99!

Addition of zero

For any two digit numbers, follow this technique:

Example:
32x42=1344

• Step 1: 32x4 = 128
• Step 2: Add 0 to the right of the number. It becomes 1280
• Step 3: 32x2=64
• Step 4: Add 1280+64
• Step 5: The answer 1344 is got!

Big digits, small effort

For multiplication of any big digit numbers with 9, here's an easy method:

Take an example, 987654x9. The answer for this is 8888886.

• Step 1: Add 0 to the right of the big digit. It becomes 9876540.
• Step 2: Subtract it with the big digit in the question. 9876540-987654.
• Step 3: It results in the answer 8888886!

Newton invented/discovered calculusin about the same amount of time the average student learns it.