20.
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If you mean the actual / literal sixes (as in 6, 16, 26, 36, 46, 56, 66, 76, 86, 96) then you will pass 10 sixes. If you're counting the 60's (60, 61, 62, 63, 64, 65, 66, 67, 68, 69) then there are 20 sixes from one to one hundred, assuming 66 is two sixes. If your counting decimals, then the answer is infinite sixes. Again, a duh question. There is only one six!
23
10 sixes and 10 sixty's
Including all the seventies there are altogether 20 of them.
The number 6 appears 20 times when counting from one to one hundred.