Caluclation of cube root of perfect cube
Byheart the following
| Rule | Number ending with | Then Last digit of cube root |
|---|
| I | 0 | 0 |
| II | 1 | 1 |
| III | 2 | 8 |
| IV | 3 | 7 |
| V | 4 | 4 |
| VI | 5 | 5 |
| VII | 6 | 6 |
| VIII | 7 | 3 |
| IX | 8 | 2 |
| X | 9 | 9 |
Procedure of calculation
| Step no | Procedure |
|---|
| 1 | find the last digit of cube root based on above rules |
| 2 | remove last three digits from the number |
| 3 | find the cube root of remaining digits of number and take least value (l) |
| 4 | place l,lastdigit side by side |
calculation of cube root of 15625
| Step no | Procedure |
|---|
| 1 | last digit = 5 |
| 2 | After removing last 3 digits, remaining =15 |
| 3 | cube root of 15 = 2 to 3 approx l = 2 |
| 4 | 25 (l last digit placing side by side) |
calculation of cube root of 91125
| Step no | Procedure |
|---|
| 1 | last digit = 5 |
| 2 | After removing last 3 digits, remaining =91 |
| 3 | cube root of 91 = 4 to 5 approx l = 4 |
| 4 | 45 (l last digit placing side by side) |
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