## Multiplication

### Multiplication

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

### Finding Square

1. Square of 15, 25, 35, 45, 55 ...........
2. Square of the numbers between 10 and 20
3. Square of the numbers between 20 and 25
4. Square of the numbers between 25 and 40
5. Square of the numbers between 40 and 60
6. Square of the numbers between 60 and 75
7. Square of the numbers between 75 and 90
8. Square of the numbers between 90 and 100
9. Square of the numbers between 100 and 110

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