Multiplying and Dividing Rational Numbers Lesson: Signed Fractions, Grades 7-8

The integer sign rules do not change when the numbers are fractions. This lesson teaches students to decide the sign first and then work with the sizes. A key-words slide covers reciprocals, improper fractions and simplifying, and a slide shows that a negative fraction can wear its sign in three places: −(3/4) = (−3)/4 = 3/(−4).

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 and a 25-minute version
• Scaffolded notes, 1 page, fill-in-the-blank to match the slides
• Practice worksheet, 2 pages: 18 practice items (10 products and quotients; 5 in context; 3 find-the-error or explain)
• Exit ticket, 3 questions, two per sheet
• Answer key, 3 pages, with every step worked
• Print-all PDF, 9 pages: the lesson plan, the student pages and the answer key in one file

Answer key included

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