Question

If you write down all the numbers from 1 to 100, then how many times do you write 4?

• A. 19
• B. 18
• C. 20
• D. 21

Hint:

To find how many times a digit appears in a range of numbers, count its occurrences in both the tens place and ones place.

Answer 1

The Correct Option is A

To count how many times the digit 4 appears, we need to look at both the tens place and the ones place in the numbers from 1 to 100. 
1. In the ones place, 4 appears in 4, 14, 24, 34, 44, 54, 64, 74, 84, and 94. This gives us 10 occurrences of 4. 
2. In the tens place, 4 appears in 40 to 49. This gives us 10 more occurrences of 4. 
Thus, the total number of times 4 is written is \( 10 + 10 = 19 \). 
Therefore, the correct answer is (A) 19.