| 9 x 9 = 81 |
| 99 x 99 = 9801 |
| 999 x 999 = 998001 |
| 9999 x 9999 = 99980001 |
| 99999 x 99999 = 9999800001 |
| 999999 x 999999 = 999998000001 |
| 9999999 x 9999999 = 99999980000001 |
| 99999999 x 99999999 = 9999999800000001 |
| 999999999 x 999999999 = 999999998000000001 |
| ............................................................................ |
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