All numbers, no matter how they are printed, are stored as 64-bit double-precision numbers. The smallest number that can be stored is a 1 preceded by 300 zeroes, and the largest is a 1 followed by 300 zeroes.
The combination of this precision and the display precision can yield a curious tape. Set the calculator to two decimal places and enter ".004 * 10000 =". Your tape will look like this:
| Entry | Tape shows |
|---|---|
| .004* | .00 * |
| 10000= |
10000.00 = _________________ 40.00 ================= |
This shows that the calculations are done with the numbers as they are entered while the tape displays the selected decimal places.