If a number is of the form N5,
then its square is given by:
(N5)2=N×(N+1)∣25(N5)^2 = N × (N + 1) | 25(N5)2=N×(N+1)∣25
Take the previous part (N) (digits before 5)
Multiply it by one more than itself
Append 25 at the end.
| No. | Number | Using "Ekādhikena Pūrvena" | Step-by-Step | Result |
| 1 | 15² | N = 1 → (1×2) | 2 | 225 |
| 2 | 25² | N = 2 → (2×3) | 6 | 625 |
| 3 | 35² | N = 3 → (3×4) | 12 | 1225 |
| 4 | 45² | N = 4 → (4×5) | 20 | 2025 |
| 5 | 55² | N = 5 → (5×6) | 30 | 3025 |
| 6 | 65² | N = 6 → (6×7) | 42 | 4225 |
| 7 | 75² | N = 7 → (7×8) | 56 | 5625 |
| 8 | 85² | N = 8 → (8×9) | 72 | 7225 |
| 9 | 95² | N = 9 → (9×10) | 90 | 9025 |
| 10 | 105² | N = 10 → (10×11) | 110 | 11025 |
Correct Answer is 13225
Step 1 11 x 12 = 132
Step 2 5 x5 = 25
Append step1 & step 2 : 13225
A) By subtraction of one
B) By one more than the previous one
C) By two less than previous
D) By half of the previous
✅ Answer: B) By one more than the previous one
A) Addition only
B) Division only
C) Squares of numbers ending in 5
D) Cube roots
✅ Answer: C) Squares of numbers ending in 5
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