Fast Math Tricks
Vedic Math
This tutorial will teach you a
technique to multiply any number
with 11 quickly.
Consider the following example.
First, write down the 1st left digit.
Add the 1st and 2nd left digits and append
the sum to the result.
Add the 2nd and 3rd left digits and append
the sum to the result (with carry on top).
Add the 3rd and 4th left digits and append the
sum to the result (with carry on top).
Append the last digit (from the left).
Add the result and its carry to produce the
answer.
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Fast basic math - multiply numbers with 11