Hi friends

We will be continuing with our vedic maths lessons after this post . This is for convenience of those friends who have just started reading the blog and are new here and want to find the GMAT preparation material i previously released on this very blog.
Following are the links to the material I published in earlier posts.

1. Download GMAT material
   
2. More GMAT resources
3. Quant resources
4. Some useful GMAT resources
   

VADIC MATHS - LESSON NUMBER TWO.

after learning how to square a number ending with 5 now we will do something called comman base method.

this method is a technique of multiplying number which comes under same base.
this base could be anything like
-10
-100
-1000 etc.

to multiply two numbers we just need to make them subtracted or added to a comman base.
lets do an example.
MULTIPLY 99 X 92

step 1:-MAKE COMMAN BASE
here the base is 100. (coz while setting the base we should keep in mind that the base should be closest to the numbers to make sure that the minimum calcultaions will be required.

step 2:-SUBTRACT THE NUMBERS FROM THE BASE AND WRITE THEM IN THE ORDER.

100- 99 = 01
100- 92 = 08
(we write the number we get after subtraction in as many digits as many zeros we have in the base, here we have 2 zeros in 100)
AND YOU HAVE TO WRITE THESE IN THE FOLLOWING SEQUENCE

99 01
X !
92 08
----------
91 08 = 9108 is the answer


this 91 we get my subtracting (92-01) or (99-08) cross digits
and 08 we get by multipling the straight line of the digits we get after subtraction from base (01 X 08)
the zero wil remain coz we have two digits in our base.

isnt it simple

now lets try this with two digits which
one is bigger than base another is smaller than base

112 X 92

so step 1:-
112-100 = +12 (no need to add zero coz we have only two zeros in base and we have two digits in 12 as well)
92-100 = -08 (the sign will be on negative coz 92 is lesser than 100)

(in the previous example we ignore negative sign by subtracting both the digits from 100 but in this case its not possible)

so now we have

112 +12
92 -08
-------------
104 -96

now we have to right it like this

10400
- 96
-----------
10304 thats the answer
-----------

you can try this on any number

try it

tables are still important

learn from 1X30 to 30X30

we will keep posting more tricks till then master these ones

gaurav

VADIC MATHS - FIRST LESSON

after getting a good response about vadic maths here is the very first lesson about this.
before starting let me tell you again that its not gona be a cup of tea but yes, we can do this all together.

keeping in mind that "practice makes a man perfect and writting makes a man exact"
we will start our very first lesson.

ok the very first thing we will discuss is squaring a number ending with 5

ok let begin with this (you must be knowing that 5 square is 25 ) ;)

step one: take a number ending with 5.

say, 45.

step two: write the ten's and unit's number 25 without thinking much.

so you have xxxxx25 (doesnt matter how many digits before 25)

step three: take the remaining number before 5 from the original number

in this case its 4

step four: add 1 to this number(step 3) and multiply the number with the number of step three.

means (4+1) X 4 = 20

step 5 : simply put this number(step 4) in front of step 2's 25

means 20 25

and thats your answer 2025

you dont even need a calculator.

now we will try this formula for some more numbers...

lets take 25.....

----- xxxxx25
------ (2+1)X2 = 6
--------- 625

thats the square of 25 :)

lets do this for a bigger number say, 85

------- xxxxx25
------- (8+1)X8 = 72
------- 7225
thats the answer

you can use the same formula for ever number ending with 5.

and now the homework comes......

you should learn the tables.... i know you have done a lot of them in school but its time to revise them

learn from 1X20 to 30X20 or atleast till 20X20

this will help when you solve three and four digit numbers...

let us know if you like this lesson coz this lesson is just the begining and we will do many more

:)