Code at Work: Receipts and Inventory
Intro to Python Programming Grades 9–12 3-day lesson 26 deliverables Connect Python calculations to the orders, receipts and stock records that help a store run. Students follow an order through its stages and explain what the code takes in and works out. They write receipt and inventory programs, repair a receipt bug and trace a restock report to check a delivery.
● Instant download · Lifetime access · Editable & print-ready
Print + digitalPDF, PowerPoint, Word & Google
Answer keysA key for every page
Built-in assessmentExit tickets + lesson quiz
45-minute daysEvery day planned and timed
A short coding level practices this lesson in CodeGrove, our code lab that runs in the browser. Students write the program, run it and check it, with no account and nothing to install. Use it with the lesson or as practice later.
Open the levelWhat does this lesson cover?
Students may see coding calculations as isolated math with no clear purpose. This lesson follows a store's work, so each calculation solves a problem students can name and check.
The lab on Day 2 has an online version that uses CodeGrove, our in-browser code lab, in the Corner Store level. It practices writing receipt and stock programs that ask for numbers, do the math and print money with two decimal places. Every online version comes with a paper version, so no internet is needed. CodeGrove is free, with no accounts or sign-ins.
Corner Store
Students write a receipt program and a stock program, fix a receipt from a bug ticket, write each exact output and explain why it works, on paper or in CodeGrove.
Everything that's included
00 Start Here
- READ FIRST: every file in the lesson and when you use it
- Teacher Guide and Pacing: the plan for each day, what to print and how to grade
- Skills map: which standards each day teaches
01 Present
- One editable PowerPoint deck for all three days, 30 slides, with speaker notes
- Slide script: the speaker notes, printed
- Bell ringers: a short warm-up for each day
02 Student Handouts
- Guided notes: one packet for all three days, in PDF and editable Word. Students fill in the blanks during the slides, with the word bank on the page
- Vocab slip: the lesson's words and what they mean, on one page
03 Labs
- Corner Store: students write a receipt program and a stock program, fix a receipt from a bug ticket, write each exact output and explain why it works, on paper or in CodeGrove
04 Activities
- Follow the Order: students follow an online order through four stations, write what goes in and what the code works out, and write what an order program prints, on paper with computers closed
- Restock Report: students trace a restock program and write the line that adds a delivery, on paper, and then they take the lesson quiz
05 Assessment
- Exit tickets: quick questions that show who needs more help
- Lesson quiz: 8 multiple-choice questions and 2 written answers about all three days
06 Answer Keys
- 5 answer key files: a key for each day (its bell ringer, notes and exit ticket) and the activity and lab keys, plus the quiz key
Digital: Google Forms™ + Google Slides™
- 4 Google Forms™ of the exit tickets and the quiz, ready to copy into your Drive
- The multiple choice grades itself, and you grade the written answers
- A Google Slides™ copy of the deck, with the same slides and speaker notes, for Google Classroom™
- Give a Form that asks students to read code only on school-managed Chromebooks in locked mode, and use the paper version on other devices
Online: CodeGrove
- CodeGrove, Corner Store level: the online version of the lab on Day 2
- Every online version has a paper version, so no internet is needed
- Free to use, with no accounts or sign-ins
Why teachers love this lesson
An order connects the store's systemsStudents trace what happens from the cart to the cloud and explain what could go wrong without code.
Receipts and stock need careful checksStudents work with tax, totals and changing stock, then fix mistakes using the expected results.
Print and digitalEvery page is a print-ready PDF, and the Google Forms™ and Google Slides™ let you teach the same lesson in Google Classroom™.
Real online activitiesStudents can use CodeGrove, our in-browser code lab, on a computer or tablet, and every online version has a paper version that works with no internet.
A key for every pageEvery day has its own answer key, and every written question has a sample answer and what to look for.
Every day fits a 45-minute classEach day's plan is timed activity by activity against real reading and writing speeds.
What Teachers Say
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How do I get the files after I buy?
Instant download right after checkout: PowerPoint and Word files you can edit, print-ready PDFs, and links that copy the Google Forms™ and Google Slides™ into your Drive.
Can I buy the whole unit or course instead?
Yes. This lesson is part of the Unit 2 bundle and the complete Intro to Python Programming course. Both cost less than buying the lessons one at a time.
Is this AP Computer Science?
No. It is a full-year, non-AP intro to Python course for grades 9 to 12. For AP, see our AP Computer Science A and AP CSP courses.
What should students know before this lesson?
Students can use print() and comments, and they can plan a program with an IPO chart. They know how to read a bug ticket and fix the program it describes.
What formats are the files in?
Every page is a print-ready PDF. The slides are an editable PowerPoint and the guided notes an editable Word file. The exit tickets and the quiz also come as Google Forms™, and the deck as Google Slides™.
Which standards does it cover?
Written for Florida's Foundations of Programming course (9007210). The skills map in the lesson shows which standards each day teaches.