Grade 9 Numeracy: Rational Numbers and Matrices


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Section 1 / Section 2 / Sections 3 and 4 / Sections 5 and 6

Section 2: Adding and Subtracting Rational Numbers

SCO:
B1 – Students will be able to model, solve, and create problems involving real numbers.
B2 – Students will be able to add, subtract, multiply and divide rational numbers in fractional and decimal forms, using the most appropriate method.

Suggested Materials: Masters 1.3, 1.8; scientific calculator

Focus: Students will estimate, calculate, and verify the sum and difference of rational numbers.

Activities:
- Split students into 4 groups to calculate the number of tiles on the ceiling or floor in a quadrant of the classroom. Usually this will be an irregular amount. Get students to calculate how many tiles would be needed in a class that is twice as big than their present classroom (addition)
- Do a few of the basic problems in the text, followed by the word problems. Use the Master worksheets for extra practice and to help them assess their progress.

My cool Math sites: NCTM / Government Math Docs / Ask Dr. Math