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
Ming is reading a storybook.
Today he read from page 21 to page 29, both included.
How many pages did he read today?
Show the hints (2)
💡Hint 1: Try a small case: from page three to page five, which pages is that?
💡Hint 2: Which page does 29 − 21 leave out?
Worked solution
Have a go first, then read the solution step by step.
1.29 − 21 = 8 counts the pages after page 21, not page 21 itself.
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