I tried searching the subject in this forum and I got a range of answers. There seem to be a lot of method's and I am in a bigger dilemma than I was.
Experts, I have a particular handy method which I did follow earlier, please verify if this is useful in the GMAT exam.
Note: It is a rough estimate only!!
for e.g. √56
We know that the square root will lie between 7 & 8. (Since their squares are 49 & 64 respectively)
We conclude our first digit is 7.
Now we divide 56 by 7 to get 8.
We then split the difference (8-7)/2 = 0.5
And now we add it to the fist digit estimate i.e 7 +0.5 = 7.5
***Our answer will be always be a tad bit higher, so we can round below.***
Concluded answer - 7.5 , Actual - 7.48..
*Works for all numbers, however large
Opinions, Experts?
Experts, I have a particular handy method which I did follow earlier, please verify if this is useful in the GMAT exam.
Note: It is a rough estimate only!!
for e.g. √56
We know that the square root will lie between 7 & 8. (Since their squares are 49 & 64 respectively)
We conclude our first digit is 7.
Now we divide 56 by 7 to get 8.
We then split the difference (8-7)/2 = 0.5
And now we add it to the fist digit estimate i.e 7 +0.5 = 7.5
***Our answer will be always be a tad bit higher, so we can round below.***
Concluded answer - 7.5 , Actual - 7.48..
*Works for all numbers, however large
Opinions, Experts?
Whether you think you can or can't, you're right.
- Henry Ford
- Henry Ford
