How many times does the digit 3 comes to with number from 10 to 100?

Question: How many times does the digit 3 comes to with number from 10 to 100?

Solution:
In the tens place:
30, 31, 32, 33, 34, 35, 36, 37, 38, 39 = 10 times

In the units place:
13, 23, 33, 43, 53, 63, 73, 83, 93 = 9 times

Total = 10 + 9 = 19

Note:
In 33, the digit 3 appears twice - once in tens place and once in units place. Both are counted separately.

So, The digit 3 appears 19 times from 10 to 100.