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 | = |