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A digit is that which we used to count numbers.
There are infinitely many possible additions: 10+11, 9+12, 8+13, 7+14, .... and then 10.5+10.5, 10.4+10.6, 10.3+10.7, 10.2+10.8, .... and then 2 digit 10.49 + 10.51, 10.48+10.52, ... and 3 digit, 4 digit, ... infinitely many digits. Next, you can look at multiplication: 1x21, 2x10.5, 3x7, and so on and then 0.1x210, 0.2*105, 0.3*70 and so on and then 2 digit decimals fractions, and then 3 digit, 4 digit, and so on, and on. And I have not even started on 3 or more numbers, or powers and other mathematical functions.
With 123 digits you can make 123 one-digit numbers.
-1230
Using a calculator will make it easier