Question

9801
how to solve this
equation
what could be the possible ones digits of the square root of each of the following numbers
(I). 9801
(2). 99856
(3). 998001
(4). 657666025

Answer 1

possible unit digits of the square roots given numbers are

numbers _____possible unit digits

(1) 9801 = 1 , 9

its because 1 comes as an unit digit of (1)^2 and (9)^2 .

(2) 99856 = 4 ,6 ,its because 6

comes as an unit digit of (4)^2 , (6)^2.

(3) 998001 = 1, 9 ( similar to q.(1) )

(4) 657666025 = 5 . reason:- 5 comes as an unit digit in ( 5 )^2

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