7-RP2

Recognize and represent proportional relationships between quantities.


a. Decide whether two quantities are in a proportional relationship, e.g., by testing for equivalent ratios in a table or graphing on a coordinate plane and observing whether the graph is a straight line through the origin. [7-RP2a]

b. Identify the constant of proportionality (unit rate) in tables, graphs, equations, diagrams, and verbal descriptions of proportional relationships. [7-RP2b]

c. Represent proportional relationships by equations. [7-RP2c]
  • Example: If total cost t is proportional to the number n of items purchased at a constant price p, the relationship between the total cost and the number of items can be expressed as t = pn.

d. Explain what a point (x,y) on the graph of a proportional relationship means in terms of the situation, with special attention to the points (0.0) and (l,r) where r is the unit rate. [7-RP2d]


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ACOS 2009 Correlation
Sixth Grade
  • 2 - Solve problems involving decimals, percents, fractions, and proportions.
  • 8 - Determining the distance between two points on a scale drawing or a map using proportional reasoning.

Seventh Grade
  • 4 - Write an algebraic equation that represents a pattern shown in a table, graph, or chart.
  • 4.1 - Recognizing the relationship between numerical patterns in tables and their respective graphs on the coordinate plane.
  • 11 - Solve problems involving ratios or rates, using proportional reasoning.

Eighth Grade
  • 12.1 - Applying proportional reasoning to identify similar and congruent shapes.
  • 12.3 - Determining ratios of perimeters and areas of similar triangles, trapezoids, and parallelograms.


CMP2 Correlation
Book
Investigation
Objective
Comparing & Scaling
2
7-RP2
7-RP2a

3
7-RP2b

4
7-RP2
7-RP2b
7-RP2c
Moving Straight Ahead
1
7-RP2a
7-RP2c
7-RP2d

2
7-RP2a
7-RP2c
7-RP2d

3
7-RP2c
7-RP2d

4
7-RP2c
7-RP2d
Stretching & Shrinking
4
7-RP2c

5
7-RP2c
Variables & Patterns
1
7-RP2c

2
7-RP2c
7-RP2d

3
7-RP2c

4
7-RP2c
Common Core Investigations
1
7-RP2
7-RP2a
7-RP2b
7-RP2d

Resources
North Carolina's Lessons for Learning
Murphy to Manteo - 7G1, 7RP2
  • I can compute actual lengths from a scale drawing.
  • I can compute fractional parts and use them for real world problems.
Changing Surface Areas - 7G6, 7RP1, 7RP2
  • I can solve real world problems involving surface area of cubes.
  • I can draw a model for a proportional relationship.
  • I can compute unit rate.

My Humble Opinion
Skills
  1. Test for equivalent ratios in a table
  2. Test for equivalent ratios by graphing
  3. Graphing points on a coordinate plane
  4. Identify the constant of proportionality in tables
  5. Identify the constant of proportionality in graphs
  6. Identify the constant of proportionality in equations
  7. Identify the constant of proportionality in diagrams
  8. Identify the constant of proportionality in verbal descriptions
  9. Represent proportional relationships by equations
  10. Explain what a point on the graph of a proportional relationship means
Vocabulary
  1. Origin
  2. Proportional
  3. Equivalent
  4. Unit rate
Additional Content
  1. Explain what a point (x,y) on the graph of a proportional relationship means in terms of the situation, with special attention to the points (0,0) and (l, r) where r is the unit rate.
Standards 2a and 2b seem very similar to the 2003 and 2009 standards 4.1 and 4.2. Those use the term "constant rate of change" instead of proportional relationship. 2a sounds like standard 4. The content of this objective is very similar to the old standard 4, but the rigor is increased.