How many numbers lie between squares of the following numbers?

(i) 12² = 144
13² = 169
169 - 144 = 25
So, there are 25 - 1 = 24 numbers lying between 12² and 13²
(ii) 25² = 625
26² = 676
676 - 625 = 51
So, there are 51 - 1 = 50 numbers lying between 25² and 26²
(iii) 99² = 9801
100² = 10000
10000 - 9801 = 199
So, there are 199 - 1 = 198 numbers lying between 99² and 100²