Aptitude - Square Root and Cube Root - Discussion

Discussion Forum : Square Root and Cube Root - General Questions (Q.No. 4)

Square Root and Cube Root

1.5625 = ?

1.05

1.25

1.45

1.55

Answer: Option

Explanation:

   1|1.5625( 1.25
    |1
    |-------
  22| 56
    | 44
    |-------
 245| 1225
    | 1225
    |-------
    |    X
    |-------

1.5625 = 1.25.

Discussion:

62 comments Page 6 of 7.

Rakshit said: 1 decade ago

@Sakshi is this method works for all numbers that has the last digit as 5 ?

Abhay said: 1 decade ago

Sakshi...U r the Best!!
Awesome...
Thnks
Too...good

Shalini said: 1 decade ago

15625 we can distributed in two parts
like 156/25 becouse we calculated the sqaure any number were ends digit is 5 the last digit of answer is always 5. now camo to second part of d no. square of 12 is 144and square of 13 is 169. square of 13 is > 156 so that we took 12 now we get "125" is the right ans.

Sakshi said: 1 decade ago

Hi Shri! 5 power of 6 and 10 power of 4
we can write it= 5 square*5 square*5 square/10 square*10 square under root
it will bcome 5*5*5/10*10 =125/100 =1.25

Shri said: 1 decade ago

Anyone can explain varun's 3rd step?

Sandeep said: 1 decade ago

Actually,

225 = 15*15 = 1*2
625 = 25*25 = 2*3
1225 = 35*35 = 3*4

So...
15625 = ????? = 12*13 = 12*12

Hence it'll be 125/100 = 1.25

SAJITHA said: 1 decade ago

Varun your solution is very helpful.

Rajesh said: 1 decade ago

the power 6 and power 4 get cancel. then we have 5 power 3 and 10 power 2.

Abdul said: 1 decade ago

Can you please tell how 125/100?

Deepti said: 2 decades ago

Varun's explanation is easier to under stand.

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