Math Lesson Plan · Grades 6–9
Proportions and Percent Lesson
Teach students to solve percent problems using proportions. The lesson introduces the is/of = percent/100 setup and applies cross-multiplication to find missing values in percent problems. Includes 20 practice problems and answer key.
Subject
Math
Grades
Grades 6–9
Skill Focus
Proportions, percent, cross-multiplication, algebra, math
Lesson Length
30–45 minutes
Lesson Overview
Solving Percent Problems with Proportions
Percent problems can be solved using the proportion: part/whole = percent/100. Given any two of these values, cross-multiply to find the third. For example, what is 25% of 80? Set up 25/100 = x/80, cross-multiply to get 100x = 2000, then divide to find x = 20.
The seven-page lesson walks through three types of percent problems: finding the part, finding the whole, and finding the percent. Students complete 20 practice problems and check their work using the answer key on page 7.
How to Use This Lesson
1. Introduce the is/of = %/100 proportion setup (pages 1–2). Review cross-multiplication from the proportions lesson.
2. Work through all three types of percent problems together (pages 3–5). Show how to identify which value is missing.
3. Assign the 20 practice problems (page 6) independently. Review answers using the key on page 7.
Printable Resource
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Full Member Resource · Printable PDF · 7 pages
Proportions and Percent Lesson
Seven-page printable: percent proportion setup, three problem types, 20 practice problems, and answer key. Grades 6–9.