Unpacked Content
Knowledge
Students know:
- Strategies for representing contexts involving rates and ratios including. tables of equivalent ratios, changing to unit rate, tape diagrams, double number lines, equations, and plots on coordinate planes.
- Strategies for finding equivalent ratios,
- Strategies for using ratio reasoning to convert measurement units.
- Strategies to recognize that a conversion factor is a fraction equal to 1 since the quantity described in the numerator and denominator is the same.
- Strategies for converting between fractions, decimals and percents.
- Strategies for finding the whole when given the part and percent in a mathematical and contextual situation.
- Strategies for finding the part, given the whole and the percent in mathematical and contextual situation.
- Strategies for finding the percent, given the whole and the part in mathematical and contextual situation.
Skills
Students are able to:
- Represent ratio and rate situations using a variety of strategies (e.g., tables of equivalent ratios, changing to unit rate, tape diagrams, double number line diagrams, equations, and plots on coordinate planes).
- Use ratio, rates, and multiplicative reasoning to explain connections among representations and justify solutions in various contexts, including measurement, prices and geometry.
- Understand the multiplicative relationship between ratio comparisons in a table by writing an equation.
- Plot ratios as ordered pairs.
- Solve and justify solutions for rate problems including unit pricing, constant speed, measurement conversions, and situations involving percents.
- Solve problems and justify solutions when finding the whole given a part and the percent.
- Model using an equivalent fraction and decimal to percents.
- Use ratio reasoning, multiplication, and division to transform and interpret measurements.
Understanding
Students understand that:
- A unit rate is a ratio (a:b) of two measurements in which b is one.
- A symbolic representation of relevant features of a real-world problem can provide for resolution of the problem and interpretation of the situation.
- When computing with quantities the transformation and interpretation of the resulting unit is dependent on the particular operation performed.
Vocabulary
- Rate
- Ratio
- Rate reasoning
- Ratio reasoning
- Transform units
- Quantities
- Ratio Tables
- Double Number Line Diagram
- Percents
- Coordinate Plane
- Ordered Pairs
- Quadrant I
- Tape Diagrams
- Unit Rate
- Constant Speed
