### Multiplication

- Trick to multiply a number by 11.
- How about multiplying 111?
- Multiplying 22, 33, 44 ........
- Multiplication of any two numbers in between 90 - 100.
- Multiplication of two numbers in between 100 - 110.
- Multiplication of two numbers in between 90 - 110.
- Multiplication of two numbers which one of the number is close to 100 (55 x 95).
- Multiplication of 99, 999, 9999 ......| Video 1 | Video 2 | Video 3
- Multiplying a number by 33 (53 x 33). | Video
- Multiplication of a double digit number by 9. Case #1 (44 x 9)
- Multiplication of a double digit number by 9. Case #2 (23 x 9)
- Multiplication of a double digit number by 9. Case #3 (37 x 9)
- Multiplication of a double digit number by 9. Case #4 (73 x 9)
- Multiplying 5, 25, 125
- Extended use of trick #14. Multiplying 75, 375, 525 and 625. | Video 1 | Video 2
- Another interesting trick - multiplying 37
- Calculating 46 x 77 in 5 seconds.
- Multiplication of two numbers where the sum of the first digit equal to 10 and the other digits are the same (36 x 34 = ?).
- Smart use of trick #18 (38 x 33).
- Multiplication of two numbers where the sum of the second digits equal to 10 and the first digits are the same. (72 x 32 = ?)
- Multiplication of two double digits numbers where the tens digit are 1 (15 x 17).
- Multiplication of two double digits numbers where the ones digit are 1 (31 x 51).
- Multiplication of two double digits numbers where the tens digit are the same (23 x 25).
- Multiplication of two double digits numbers where the ones digit are the same (56 x 76).
- Multiplication of two consecutive numbers (26 x 27).
- Multiplication of a number between 10 and 20 by a number between 20 and 30.
- Multiplication of two numbers between 50 and 70.
- Multiplication of two numbers between 30 and 50.
- Multiplication of a number less between 10 and 20 by any numbers.
- Multiplication of two numbers where the average of the numbers is a multiples of 10. (17 x 23 = ?)
- Multiplication of an even number with a multiple of 5 (24 x 35)
- Multiplication of 99, 999, 9999 ......
- When the multiplier is close to 100.
- Even number multiply by 5, 15, 25, 35, 45 .....................
- The Chinese Method

### Finding Square

- Square of 15, 25, 35, 45, 55 ...........
- Square of the numbers between 10 and 20
- Square of the numbers between 20 and 25
- Square of the numbers between 25 and 40
- Square of the numbers between 40 and 60
- Square of the numbers between 60 and 75
- Square of the numbers between 75 and 90
- Square of the numbers between 90 and 100
- Square of the numbers between 100 and 110

### Advance Method

- Multiplication of a big number by 2
- Multiplication of a big number by 3
- Multiplication of a big number by 4
- Multiplication of a big number by 5
- Multiplication of a big number by 6
- Multiplication of a big number by 7
- Multiplication of a big number by 8
- Multiplication of a big number by 9
- Long multiplication of 3 - 4 digits numbers.

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