Vedic Maths – Multiplication of any number by 11, 12, 13 … 19 the fast and simple way!

I learnt a nifty trick today. It has to do with the age old study of Vedic Maths So here it is: For Example if we have to multiply 943 * 13 (bcd * 1.x) 1. Rewrite the number as 0943 (Add a zero to the beginning of the number to be multiplied) 2. Multiply the last digit (d) with the last digit of the number (x) here we get 3 * 3 = ____9 3. Multiply the second last digit (c) with x and then add the previous digit. Here 4  * 3 = 12 + 3 = 15. Now write 5 and carry 1 forward so the answer becomes ___59 4. Multiply the next digit (b) with x and add the previous digit and the carry. Here 9 * 3 = 27 + 4 = 31 + 1 (Carry) = 32 again carry 3 and write 2 in the answer so we get __259 5. Multiply next digit (0 in this case) with x and add the previous digit and the carry. So we get 0 * 3 = 0 + 9 = 9 + 3 (Carry) = 12. Now we get the final answer which is 12259 Go ahead give it a try with 86926431 * 18