Bengaluru mathematician develops easy method to multiply any two numbers

Multiplying any two numbers will soon be child’s play. Romith Rao, a city-based mathematician, has devised a three-step method to multiply any two numbers (integers) ranging from one to infinity.

Rao’s formula has been inspired by the Vedic mathematics formula ‘Ekadhikena Purvena’ (one more than the previous), which is useful in finding the squares of numbers.

“Excellent problem-solving skills are some of the most important skills that one needs in life. We all work with numbers in our daily lives and good numerical ability is essential in making critical decisions in life,” said Rao.

“This formula will be highly useful for people from all walks of life and particularly for students appearing for aptitude tests and other examinations that test mathematical abilities,” added Rao.
Rao’s formula has been published in the Online International Journal of Vedic Mathematics.
The formula

To use the formula, let us choose two numbers — 127 and 63.

Step 1:  Multiply the numerals in the units place (7*3=21). Write the numeral in the units place of the product (1) in the units place of the final product. Carry the remainder (2) to the next step. 

Step 2: Now, ignore the numeral in the units place of 127 and 63. The new integers thus formed are 12 and 6. Cross multiply these with the numerals in the units place of the original integers (127 and 63) and add them together i.e. (12*3) + (6*7) = 36+42 =78. Add the remainder from the previous step (2) to this result (78+2 = 80). Now, write the numeral in the units place of the result (0) in the tens place of the final product. Carry the remainder (8) to the next step.

The product obtained so far is 01. 

Step 3: Multiply the two new integers from Step 2 (12*6 = 72). Now add the remainder from the previous step (72+8 = 80) and add the sum to the product obtained (01) to arrive at the final answer.
Thus the final product of multiplication of 127 and 63 is 8001.
DH News Service