Latest self Aptitude Question SOLUTION: square of 2 digit number ending with '5'

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square of 2 digit number ending with '5'

Deepika kannan (12 years ago)

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Rohit  (12 years ago)

To calculate square of two digit number ending with 5, there is one simple formula.

If
X5 is the number, then last two digits will be 25 and preceding digits are given by x*(X+1)

(X5)^2 = x*(X+1) 25
e.g
25^2 will be written as (2*3)_ 25 = 625
75^2 = (7*8)_25 = 5625

Is this solution Helpfull? Yes (3) | No (1)  

Vignesh  (12 years ago)

15,25,35,45,55,65,75,85,95

Only 2 digit numbers which end with 5 have such possibilities.

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Rohit  (12 years ago)

25^2 = 625
5^2=25

Is this solution Helpfull? Yes (1) | No (1)  

Vignesh  (12 years ago)

15,25,35,45,55,65,75,85,95

Only 2 digit numbers which end with 5 have such possibilities.

square of 15 = 225
square of 25 = 625
square of 35 = 1225
square of 45 = 2025
square of 55 = 3025
square of 65 = 4225
square of 75 = 5625
square of 85 = 7225
square of 95 = 9025

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B.Senthil Kumar  (12 years ago)

These are the answers:
15,25,35,45,55,65,75,85,95

Is this solution Helpfull? Yes | No (1)  

Muhammad Ahmed  (11 years ago)

The answer is 625 which is the square of two digit (25) and ending with 5.

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