Intro to Python Programming Lesson 4.3: Counting and Adding Up
Intro to Python Programming Lesson 4.3 cover, Counting and Adding Up
Intro to Python Programming · Unit 4 · Lesson 4.3

Counting and Adding Up

Intro to Python Programming Grades 9–12 4-day lesson 32 deliverables

Help students use Python loops to count inputs, build totals and calculate useful results. Students trace counters and totals through each pass, then write programs that add scores or track money. They find averages, update a gift card balance and repair code that resets a total or prints a result too early.

Single lesson
$10

● 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
Save when you bundle Unit 4: Loops The complete Unit 4, all 6 lessons $45 Save 15% $53 bought separately See the unit bundle
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3 coding levels come with this

See the levels

Short coding levels practice 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 them with the lesson or as practice later.

See the levels
What's inside

What does this lesson cover?

Students often start a total or find an average in the wrong place inside a loop. This lesson uses tracing and bug repairs to show where each line belongs.

The labs on Day 2 and Day 3, and the activity on Day 4 have online versions that use CodeGrove, our in-browser code lab, in the Scorekeeper level. It practices writing while loops that add up answers until the user types 0, count the passes and show 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.

Featured original activity

Scorekeeper

Students write three programs that add up answers until the user types 0, write each exact output and explain how each one works, on paper or in CodeGrove.

32 deliverables

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 four days, 36 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 four 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

  • Scorekeeper: students write three programs that add up answers until the user types 0, write each exact output and explain how each one works, on paper or in CodeGrove
  • Class Average: students find a total and an average, track a gift card balance and fix an average that prints inside the loop, on paper or in CodeGrove

04 Activities

  • Running Total: students trace a counter and a running total pass by pass, write what two programs print and explain the difference, and find an average after the loop, on paper with computers closed
  • Total Bug: students fix a points program from a bug ticket in Total Bug, on paper or in CodeGrove, 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 four days

06 Answer Keys

  • 6 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™

  • 5 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, Scorekeeper level: the online version of the labs on Day 2 and Day 3, and the activity on Day 4
  • 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

Students follow totals as they grow

They record each pass to see the difference between counting entries and adding their values.

Placement changes what the program reports

Students compare similar programs and explain why the results differ. They fix totals or averages that restart or print too soon.

Print and digital

Every page is a print-ready PDF, and the Google Forms™ and Google Slides™ let you teach the same lesson in Google Classroom™.

Real online activities

Students 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 page

Every 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 class

Each day's plan is timed activity by activity against real reading and writing speeds.

What Teachers Say

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Questions teachers ask

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 4 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 know how to use input() with int() to ask for a whole number, how to compare two values and how to do math with Python's math operators.

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.