How many times does the digit 6 appear in the list of all integers from 1 to 100?

Answer 1

number of single digits without a 6 = 8
number of double digits without a 6 = 8*9 = 72
number of triple digits without a 6 = 1
number without a 6 = 81

so number containing a 6 = 100-81 = 19

Answer 2

6, 16, 26, 36, 46, 56, 66, 76, 86, 96. 10 times.
61, 62, 63, 64, 65, 67, 68, 69. 8 times.
10+8 = 18 times.

Answer 3

Henry2, what about 60?
so that makes it 19

Answer 4

Its 20.