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In face-to-face/tabletop games, d100 rolls shall be made using a d% and a standard d10 and adding the results at face value.

d%
A 10-sided die labeled from 00 to 90.
d10
A 'standard' 10-sided die labeled from 1 to 10.

This means that a result of 00 (d%) and 10 (d10) is 10, not 0, not 100.

Miss Chance

When rolling miss chance, this means that only the d% actually needs to be rolled since even the lowest result on the d10 (i.e. 1) results in a sum that beats the miss chance.

Proof
Miss Chance 20%
20 (d%) + 1 (d10) = 21 > 20 *success*
20 (d%) + 10 (d10) = 30 > 20 *success*
10 (d%) + 10 (d10) = 20 !> 20 *failure*