Hi,
Since this is my 1st post, ill put something useful which is obviously not available everywhere.
How about Vedic mathematics?
We generally write competitive exams where we typically do lot of calculations so calculating squares is time consuming. Here is a technique to do it very easily. Once we master this, there is no need for pen and paper.
Pre requsite biheart upto 25^2 and we can calculate upto 125^2 very easily.
Between 25-75
x^2 =
step 1 : x -25 gives 1st 2 digits.
step 2: (50-x)^2 are last 2 digits.
since the number is greater than 25, (50-x)^2 is at max is 24^2 which we already bi-hearted
Take 37.
37-25 = 12 1st 2 digits
50 - 37 = (13)^2 = 169
Now we have to add this 1 as carry to 12 which makes it 13
Hence answer is 1369(Check this using a calculator if you are still in doubt)
Now 29^2
29 - 25 = 04
(50-29)^2 = (21)^2 = 441. 1st 4 is carry and hence 841.
Will give the details of 75-125 in my next post.
Cheers!
Since this is my 1st post, ill put something useful which is obviously not available everywhere.
How about Vedic mathematics?
We generally write competitive exams where we typically do lot of calculations so calculating squares is time consuming. Here is a technique to do it very easily. Once we master this, there is no need for pen and paper.
Pre requsite biheart upto 25^2 and we can calculate upto 125^2 very easily.
Between 25-75
x^2 =
step 1 : x -25 gives 1st 2 digits.
step 2: (50-x)^2 are last 2 digits.
since the number is greater than 25, (50-x)^2 is at max is 24^2 which we already bi-hearted
Take 37.
37-25 = 12 1st 2 digits
50 - 37 = (13)^2 = 169
Now we have to add this 1 as carry to 12 which makes it 13
Hence answer is 1369(Check this using a calculator if you are still in doubt)
Now 29^2
29 - 25 = 04
(50-29)^2 = (21)^2 = 441. 1st 4 is carry and hence 841.
Will give the details of 75-125 in my next post.
Cheers!
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