Percent Error Lesson: Measured vs Actual Values, Grades 7-8

Max guesses there are 420 beans in a jar. There are 500. How far off was he? Percent error compares the error, the distance between the estimate and the actual value, with the actual value: |estimate - actual| divided by actual. This lesson teaches students to find it and to read what a small or large percent error says about an estimate.

What's inside

• 18 slides, with speaker notes on all 18
• Lesson plan, 2 pages: standards, materials, objective, a teacher-guided sequence keyed to slide numbers, a "Watch For" note, a 25-minute version and a note on using the deck in Google Slides
• Scaffolded notes, 1 page, fill-in to match the slides
• Practice worksheet, 2 pages: 17 items
• Exit ticket, 3 questions, two to a sheet
• Unit Check, 1 page, 10 items
• Answer key, 3 pages, with the steps worked out and the Unit Check answers
• Print-all PDF, 10 pages, the day's lesson plan, notes, practice, exit ticket, Unit Check and answer key in one file

Answer key included

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