Question

1.
Find the square by
square by using duplex
method. (Vedic Mathe)
(312)
su (135)​

Answer 1

Answer:

that they do this using the duplex method and if you take some time to learn this, you will be very fast in squaring numbers and taking square roots.

I took some time to play around with this and it really speeds things up.

First, what is a duplex?

If a, b, c, d, e, f, etc. are digits, then

d(a) = a^2

d(ab) = 2ab

d(abc) = 2ac + b^2

d(abcd) = 2ad + 2bc

d(abcde) = 2ae + 2bd + c^2

etc.

In other words, from the outside working inwards, take the outermost digits, multiply them, double them, then take the next adjoining digits, multiply then, double them, then the next digits. etc.

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