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Illustrative Mathematics
Illustrative Mathematics: 7.rp Chess Club
Seventh graders use their knowledge of proportional relationships to determine the percent increase or decrease.
Illustrative Mathematics
Illustrative Mathematics: 7.rp Comparing Years
In this lesson, 7th graders determine the proportional relationships to determine the percent decrease.
PBS
Pbs: The Lowdown: Percents Combined: Proportional Relationships With Multistep Ratio and Percent Problems
Learn how to calculate sale price when combining two "percent-off" discounts in this video from KQED. In the accompanying classroom activity, students develop and share a variety of strategies, including modeling with a 10 x 10 grid to...
McGraw Hill
Glencoe Mathematics: Online Study Tools: Ratio, Proportion, and Percent
Students show comprehension of basic arithmetic skills. The online test assesses scholars on ratios, proportions, and percents.
PBS
Pbs Learning Media: Atmospheric Oxygen
In this feature, adapted from Interactive NOVA: Earth, students explore the relationship between oxygen concentration and the well-being of various organisms by simulating a change in oxygen levels and observing what happens.