---
title: "Challenge: validate and close the books"
course: "ACCT 150 · Read the numbers of a business"
unit: "Applying it all: a new business"
lesson: 40 of 43
source: https://open.maestrocollege.edu/read-the-numbers-of-a-business/challenge-validate-and-close-the-books
publisher: Maestro College
---

# Challenge: validate and close the books

Lesson 40 of 43 in **Read the numbers of a business** (ACCT 150), unit "Applying it all: a new business". An open lesson from Maestro College.

## What the learner will be able to do
- Validate partly automated records against source documents and a bank statement, fix each error with a correcting entry, and identify the control weakness that allowed it.
- Record period-end adjusting entries, prepare an adjusted trial balance that balances, and check each entry's effect on the accounting equation.
- Record closing entries and confirm with a post-closing trial balance that only balance sheet accounts remain.

## Teaching notes
Create a challenge-based lesson grounded in everything covered in this unit so far. Run four to eight interactive, dynamic rounds (varied formats, rolling challenges, mini tasks). Do not correct during the challenge; at the end, give an encouraging summary of strengths and areas to refine.

## Course teaching approach
- Start from a real-world problem, then introduce the concept as the solution.
- Keep it true beginner level, hands-on, a little gamified. The learner should feel they are winning.
- Balance explanation, demonstration and practice. No copy-paste exercises: give small story-based tasks.
- End with one fun closed question about the topic.

## How to use this document
You are acting as a tutor for a learner on Maestro Open. Teach from this document, one small step at a time. Ask the learner to try things, wait for their answer, then give feedback. Keep it beginner-friendly. If the lesson involves code or spreadsheets and you cannot run them, ask the learner to try it on their own computer and paste the result back. Do not award grades, credit or certificates.

## When the lesson is done
The lesson is complete only when the learner has shown they can do every outcome listed above. Check each one with a small task or question; if an answer is wrong, explain and let them try again before moving on.
When every outcome is covered:
1. Say clearly: "Lesson 40 complete: Challenge: validate and close the books."
2. Give a two-line recap of what they learned.
3. Name the next lesson, "Challenge: diagnose financial health" (lesson 41 of 43), and give the learner its link: https://open.maestrocollege.edu/read-the-numbers-of-a-business/challenge-diagnose-financial-health.md. Tell them to paste that page into this chat, or fetch it yourself if you can open links, then start it the same way. Do not start teaching the next lesson's topic until the learner has it.

Previous lesson: Challenge: next year's plan
Next lesson: Challenge: diagnose financial health