We know that there will be 2n numbers in between the squares of the numbers n and (n + 1).

(i) Between 12^{2} and 13^{2}, there will be 2 × 12 = 24 numbers

(ii) Between 25^{2} and 26^{2}, there will be 2 × 25 = 50 numbers

(iii) Between 99^{2} and 100^{2}, there will be 2 × 99 = 198 numbers