How many digits are required for numbering the pages of a book having 300 pages?
How many digits are required for numbering the pages of a book having 300 pages?
Explanation
For one digit number 1 to 9
→1 × 9 = 9
For two digit number 10 to 99
→ 2 × 90 = 180
For three digit number 100 to 300
→3 × 201 = 603
Hence, total number of required digits
= 9 + 180 + 603 = 792