VEDIC MATHEMATICS - USING IT IN PERFORMING THE MULTIPLICATION OF NUMBERS EASILY AND QUICKLY

Please study

Vedic Mathematics applied to Multiplication Table

before studying the principle and
its application discussed here.

Carrying out tedious and cumbersome
arithmetical operations, easily, speedily
and in some cases executing them mentally
comes under the realm of High Speed maths.

The methods of arithmetical operations
applied are totally unconventional.

People who are deeply rooted in the
conventional methods, may find it difficult,
at first reading, to understand the methods.

But, these methods, based on the Sutras
(aphorisms or Formulas) of Ancient Indian
Vedic Mathematics are simple and easy to understand,
remember and apply, even by little children.

Here we deal with the principles appled to
Multiplication. For the application to other
topics of math, go to Vedic Maths eBook.
for more details, see near the bottom of the page.

The Urdhva Tiryak Sutra
(meaning : Vertically and cross-wise)

This is a general Formula applicable
to all cases of multiplication.

Using this principle, we can find
the product of two numbers easily.

Multiply vertically and crosswise
to get the digits of the product.

Examples will clarify the method.

Before seeing the examples, let us see
the formula for finding the product of
two digit numbers.

Let us say the two digits of the first number
be 'a' (tens' digit) and 'b'(units' digit).

And those of the second number be
'p' (tens' digit) and 'q'(units' digit).

Write the digits of the two numbers
one below the other as follows.

          a  b
          p  q

          a  b
          p  q
          ------
          ap/(aq+pb)/bq
          ------

(aq+pb) is the Tens' part which is the
sum of the cross-wise products 'aq' and 'pb'.

'bq' is the units' part which is
the vertical product of the second column.

Let us see the method by examples.

Example 1 of Vedic Mathematics

To find 21 x 13

          21                  
          13
          -----
          2x1/2x3+1x1/1x3
          = 2/7/3
          21 x 13 = 273 

First part of the product
= product of first vertical digits
= 2x1 = 2

Second part of the product
= sum of the cross-wise products
= 2x3+1x1 = 6+1 = 7

Third part of the product
= product of second vertical digits
= 1x3 = 3

Thus 21 x 13 = 273.

Example 2 of Vedic Mathematics

To find 41 x 51

          41
          51
          ----
          4x5/4x1+5x1/1x1
          =20/9/1
          41x51 = 2091

First part of the product
= product of first vertical digits
= 4x5 = 20

Second part of the product
= sum of the cross-wise products
= 4x1+5x1 = 4+5 = 9

Third part of the product
= product of second vertical digits
= 1x1 = 1

Thus 41 x 51 = 2091.

Example 3 of Vedic Mathematics

To find 23 x 42

          23
          42
          ----
          2x4/2x2+4x3/3x2
          =8/16/6
          =8+1/6/6
          =9/6/6
          23x43 = 966

First part of the product
= product of first vertical digits
= 2x4 = 8

Second part of the product
= sum of the cross-wise products
= 2x2+4x3 = 4+12 = 16

This is a two digit number.

Units digit (6) is retained and tens' digit (1)
is carried over to the immediate left place.

See that in 16, 1 is written in small letters
indicating its carry over to the immediate
left place and 6 is written normally
indicating it is retained in its place.

Third part of the product
= product of second vertical digits
= 3x2 = 6

Thus 23 x 42 = 966.

To explain the procedure clearly,
so many steps are shown.

In practice we can do the calculations mentally
and write the answer in fewer steps as follows.

          23
          42
         ----
          8/16/6
          =9/6/6 (worked out from right)

          23 x 42 = 966.

To find 37 x 29

          37
          29
          ----
          3x2/3x9+2x7/7x9
          =6/27+14/63
          =6/27+14+6/3
          =6/47/3
          =6+4/7/3
          =10/7/3
          37x29=1073

First part of the product
(before carry over from second part)
= product of first vertical digits
= 3x2 = 6

Second part of the product
(before carry over from third part)
= sum of the cross-wise products
= 3x9+2x7 = 27+14

Third part of the product
= product of second vertical digits
= 7x9 = 63

This is a two digit number.

Units digit (3) is retained and tens' digit (6)
is carried over to the immediate left place.

See that in 63, 6 is written in small letters
indicating its carry over to the immediate
left place and 3 is written normally
indicating it is retained in its place.

Now,
Second part of the product
(after carry over from third part)
= 27+14+6 = 47

This is a two digit number.

Units digit (7) is retained and tens' digit (4)
is carried over to the immediate left place.

See that in 47, 4 is written in small letters
indicating its carry over to the immediate
left place and 7 is written normally
indicating it is retained in its place.

Now,
First part of the product
(after carry over from second part)
= 6+4 = 10

Thus 37 x 29 = 1073.

To explain the procedure clearly,
so many steps are shown.

In practice we can do the calculations mentally
and write the answer in fewer steps as follows.

          37
          29
          ----
          6/41/63
          =10/7/3 (worked out from right)

          37 x 29 = 1073.

To find 68 x 79

          68
          79
          ----
          6x7/6x9+7x8/8x9
          =42/54+56/72
          =42/110+7/2
          =42/117/2
          =42+11/7/2
          =53/7/2
          68x79=5372

Thus 68 x 79 = 5372.

To explain the procedure clearly,
so many steps are shown.

In practice we can do the calculations mentally
and write the answer in fewer steps as follows.

          68
          79
          ----
          42/110/72
          =53/7/2 (worked out from right)
          68 x 79 = 5372.

Proof of the method adopted

Multiplying two digit numbers is similar with y = 10

10²term and units term are vertical products and 10 term is cross-wise products' sum.

[a(10) + b][p(10) + q] = 10²(ap) + 10(aq + bp) + bq

The digits of the two numbers :

          a  b
          p  q

ap/(aq + pb)/bq (proved.)

To find the products of three digit numbers
by using vedic mathematics, go to

Mental Math.

Vedic Maths eBook

* in remembering Multiplication Tables,

* with shortcuts for multiplication including decimal multiplication,

* with easy Tips for division,

* with simple Techniques and strategies for adding, subtracting and multiplying Fractions,

* in easily finding Squares and Square roots.

For more information or to watch sample videos or to order go to
Vedic Mathematics eBook.

Exercise on Vedic Mathematics

(1) You may take any two digit numbers
and apply the above method for multiplying
and verify your answers with calculator.

(2) You may prepare the multiplication table upto 20x20
by filling the entries using the method described here.