---
title: Olympiad: how many digits number the pages of a book — a lesson of Mova's school · trees and pragmatics
description: «Olympiad: how many digits number the pages of a book», a lesson of the lessons course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Pages 1 to 9 use one digit each: 9 digits.
---

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# Olympiad: how many digits number the pages of a book

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Lesson 160 of the lessons course of Mova's primary school: 6 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0).

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- [0](https://md.mova.elamur.ai/free/en/corpora/school/lessons/160-digits-on-the-pages/0/) — Pages 1 to 9 use one digit each: 9 digits.
- [1](https://md.mova.elamur.ai/free/en/corpora/school/lessons/160-digits-on-the-pages/1/) — Pages 10 to 99 are 90 pages with two digits each: 180 digits.
- [2](https://md.mova.elamur.ai/free/en/corpora/school/lessons/160-digits-on-the-pages/2/) — Up to page 99 that is 189 digits.
- [3](https://md.mova.elamur.ai/free/en/corpora/school/lessons/160-digits-on-the-pages/3/) — Every page from 100 on uses three digits.
- [4](https://md.mova.elamur.ai/free/en/corpora/school/lessons/160-digits-on-the-pages/4/) — So take away 189, divide by 3, and add the result to 99.
- [5](https://md.mova.elamur.ai/free/en/corpora/school/lessons/160-digits-on-the-pages/5/) — A book numbered with 270 digits: 270 - 189 = 81, 81 ÷ 3 = 27 pages after page 99, so the book has 99 + 27 = 126 pages.

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