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Algebra 1 2-10 Complete Lesson: Change Expressed as a Percent

By Matt Richardson
Last updated almost 3 years ago
26 Questions
Note from the author:
A complete formative lesson with embedded slideshow, mini-lecture screencasts, checks for understanding, practice items, mixed review, and reflection. I create these assignments to supplement each lesson of Pearson's Common Core Edition Algebra 1, Algebra 2, and Geometry courses. See also mathquest.net and twitter.com/mathquestEDU.

Solve It! Two stores advertised sales on their websites, as shown. Before the sale, each sweater cost $35. Which store offers the better deal?

Explain how you know.

Problem 1 Got It?

Problem 2 Got It? In one year, the toll for passenger cars to use a tunnel rose from $3 to $3.50. What is the percent increase?

Problem 3 Got It?

Problem 4 Got It?

Vocabulary: Determine whether the situation involves a percent increase or a percent decrease.

A hat that originally costs $12 sold for $9.50.

Vocabulary: Determine whether the situation involves a percent increase or a percent decrease.

You buy a DVD for $10 and sell it for $8.

Vocabulary: Determine whether the situation involves a percent increase or a percent decrease.

A store buys glasses wholesale for $2 per class. The store sells them for $4.50

Reasoning: What is the greatest possible error of a measurement taken to the nearest tenth of a meter? Hint: Consider how many centimeters are in one tenth of a meter.

Writing: How is calculating percent increase different from calculating percent decrease?

Review Lesson 2-9: What percent of 12 is 9?
Enter your response in the following format: 4%

Review Lesson 2-9: What is 35% of 185?
Enter only a number. Use decimal form, if necessary.

Review Lesson 1-3: Graph the numbers on the same number line.

Review Lesson 1-3: Drag the numbers to sort them from least to greatest.
The top should represent the least, the bottom the greatest.

  1. 1/2
  2. -3
  3. 2
  4. -2.8

Vocabulary Review: Match each coin with the percent of a dollar it represents.

  • penny
  • quarter
  • nickel
  • dime
  • 50-cent piece
  • 5%
  • 10%
  • 1%
  • 50%
  • 25%

Describe the change as an increase or decrease. 72 to 84

Describe the change as an increase or decrease. 25 to 16

Describe the change as an increase or decrease. $.99 to $1.02

Notes: Take a clear picture or screenshot of your Cornell notes for this lesson. Upload it to the canvas. Zoom and pan as needed.

For a refresher on the Cornell note-taking system, click here.

Reflection: Math Success