Two of them.
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There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
83
0.019
2 of them.
12.5 X 6 = 75 square cm. (This more than the justified number of significant digits, unless "6" is interpreted to mean an exact integer.)