19 times in all, including twice in 66.
19.
The number 7 occurs once. The digit 7 occurs 20 times.
How many times does the digit 1 occur in ten place in the numbers from 1 to 1000?
20 times
19 times
ten times
963
24
48
11
That looks like it should be the same as 10 times (the number of times the digit 1 occursin the units place in the numbers from 10 to 100), which would work out to 90 .
20 times if you're counting by ones.