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# Course 3, Lesson 34, Proportions/Ratio Word Problems

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Author: Hector Soto
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1. Make sense of problems and persevere in solving them. 2. Model with mathematics. 3. Know and apply the properties of integer exponents to generate equivalent numerical expressions. 4. Use numbers expressed in the form of a single digit times an integer power of 10 to estimate very large or very small quantities, and to express how many times as much one is than the other. 5. Understand that a function is a rule that assigns to each input exactly one output. The graph of a function is the set of ordered pairs consisting of an input and the corresponding output. 6. Understand that a two-dimensional figure is similar to another if the second can be obtained from the first by a sequence of rotations, reflections, translations, and dilations; given two similar two-dimensional figures, describe a sequence that exhibits the similarity between them. 7. Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles.

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Tutorial

## Proportions and Ratio Word Problems

Source: Andrew Strickland