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# Course 2, Lesson 9, Adding, Subtracting, and Multiplying Fractions

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Author: Hector Soto
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1. Model with mathematics. 2. Look for and make use of structure. 3. Understand that integers can be divided, provided that the divisor is not zero, and every quotient of integers (with non-zero divisor) is a rational number. If p and q are integers, then -(p/q) = (-p)/q = p/(-q). Interpret quotients of rational numbers by describing real-world contexts. 4. Apply properties of operations as strategies to multiply and divide rational numbers. 5. Solve real-world and mathematical problems involving the four operations with rational numbers. 6. Use properties of operations to generate equivalent expressions.

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