Posted by admin on July 30th, 2009
Multiplying two numbers whose difference is two.
You can use this trick for calculations such as 11 x 13, 13 x 15, 24 x 26 etc. where the numbers differ by 2.
Square the number between these two numbers and then subtract 1 from the result.
Have fun with the trick
Time for you to try
| 14 |
x |
12 |
= |
|
| 21 |
x |
19 |
= |
|
| 11 |
x |
13 |
= |
|
| 36 |
x |
34 |
= |
|
| 99 |
x |
101 |
= |
|
Posted by admin on July 16th, 2009
Cross Multiplication
This is a very powerful trick. You can multiply any 2 digit number by another 2 digit number.
Have fun with the trick
22 x 31 = ?? (Write the multiplicants is the this form)
Posted by admin on July 1st, 2009
Multiplying two numbers between 101 to 109
Here the answer will be a five digit number beginning with 1.
Have fun with the trick
Little Variation:
102 x 107 = ??
Time for you to try
| 108 |
x |
101 |
= |
|
| 105 |
x |
105 |
= |
|
| 101 |
x |
101 |
= |
|
| 109 |
x |
109 |
= |
|
| 104 |
x |
107 |
= |
|
| 106 |
x |
102 |
= |
|
