How many 4s are there between 11 and 100 ?

Count the occurrences of the digit '4' between 11 and 100 (inclusive).

1. Tens place (40–49): There are ten numbers 40, 41, 42, 43, 44, 45, 46, 47, 48, 49. Each has a '4' in the tens place, contributing 10 occurrences.

2. Ones place: Numbers ending in 4 are 14, 24, 34, 44, 54, 64, 74, 84, 94 — nine numbers, contributing 9 occurrences. Note that 44 contributes one occurrence in the tens place and one in the ones place; both are counted.

Total occurrences = 10 (tens place) + 9 (ones place) = 19.