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title: Two-digit numbers with a given digit sum — a lesson of Mova's school · trees and pragmatics
description: «Two-digit numbers with a given digit sum», a lesson of the lessons course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: A two-digit number has a tens digit from 1 to 9 and a ones digit from 0 to 9; count the numbers by trying each tens digit in turn
---

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# Two-digit numbers with a given digit sum

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Lesson 184 of the lessons course of Mova's primary school: 4 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/184-digit-sum-count/0/) — A two-digit number has a tens digit from 1 to 9 and a ones digit from 0 to 9; count the numbers by trying each tens digit in turn.
- [1](https://md.mova.elamur.ai/free/en/corpora/school/lessons/184-digit-sum-count/1/) — Digit sum 5: tens 1, 2, 3, 4, 5 give 14, 23, 32, 41, 50, that is 5 numbers.
- [2](https://md.mova.elamur.ai/free/en/corpora/school/lessons/184-digit-sum-count/2/) — For a sum up to 9 there are as many numbers as the sum.
- [3](https://md.mova.elamur.ai/free/en/corpora/school/lessons/184-digit-sum-count/3/) — Digit sum 13: the ones digit can be at most 9, so the tens digit is at least 4: 49, 58, 67, 76, 85, 94, that is 6 numbers, 19 - 13.

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