An easy question on page numbers for P2–P3, with a step-by-step solution, diagrams and the answer. Common in the Hua Xia Cup's P2 to P5 papers: how many digits in all, how often a digit appears, and pages torn out.
The question
A storybook's pages are numbered from 1 to 20.
How many digits are printed altogether?
Show the hints (2)
💡Hint 1: Page 9 uses 1 digit. How many does page 10 use?
💡Hint 2: Count the one-digit and two-digit page numbers separately.
Worked solution
Have a go first, then read the solution step by step.
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