abhi7605 wrote this blog titled "VEDIC MATHS - MULTIPLICATION BY SERIES OF 9 case I"

CASE I

MULTIPLICANT AND MULTIPLIER SHOULD BE SAME NOS.

STEP 1. Reduce the no. by 1

STEP 2. Then subtract the result by 9 series

e.g.1- 83 X 99

STEP 1. Reduce the no. by 1

82

STEP 2. Then subtract the result by 9 series

9-8 =1

9-2=7

Finally the answer will be 8217

e.g. 2 - 402 x 999

STEP 1. Reduce the no. by 1

401

STEP 2. Then subtract the result by 9 series

9-4 =5

9-0=9

9-1=8

Finally the answer will be 401598

e.g. 3 - 17825 x 99999

STEP 1. Reduce the no. by 1

17824

STEP 2. Then subtract the result by 9 series

9-1 =8

9-7=2

9-8=1

9-2=7

9-4=5

Finally the answer will be 1782482175