Let us understand it by taking two examples.
Multiply 99 × 97
Multiply 103 × 105
Steps to perform this are:-
- Find by how much the number is more or less than the power of 100 and write it on the right side of the vertical line.
- Either cross subtracts or cross add. This will form the first part of the final answer.
- Multiply the right side of the vertical line and this shall form the right side of the result.
- Add this multiplied number to the end giving 9603 and 10815 respectively.
This is how you can multiply numbers close to 100 in just 3 steps.
Try some on your own.
- 102 x 105
- 98 x 93
- 99 x 99