National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Cake Recipe Ratio
Dr. Math has to go into the kitchen to solve this real-world problem. A student is looking for a solution to a ratio problem about baking a cake. You'll need to stir up your knowledge of ratios, fractions, decimals, proportions, and...
University of Arizona
Pulse: Powerful Explorations of Health and Energy
A cross curricular unit where students simulate an energy task meeting to discuss protecting human health through energy policies. The unit covers content for twelfth grade in math, physics, language arts, and government. Topics reviewed...
University of Arizona
Pulse: Industrialization, Chemicals and Human Health
While students gain an understand of basic environmental toxicology, they explore the health impacts of industrialization on society in these lessons. This is a cross curricular unit that addresses standards for eleventh grade in math,...
Other
Art in Canada: Art Talk: Composition Glossary
A definition of composition with other terms and how they relate to composition. This site shows an example and also explains the terms provided.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: Ratio and Proportion
The Math Page tutorial explains and defines ratio and proportion and includes this practice section at the end of the lesson.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: Proportionality
Acquire a deeper understanding of the concept of proportionality. Concise definitions, detailed examples, and an interactive worksheet to apply what you have learned.
Texas Instruments
Texas Instruments: Lifting a Lion
In this activity, students learn to solve a real-world problem. Using a toy lion and a lever, students discover how much work is needed to raise the toy lion. They use proportions to determine the force needed to lift a real lion.
Illustrative Mathematics
Illustrative Mathematics: 7.rp Stock Swaps, Variation 3
A multi-step performance task word problem: Microsoft Corp. has made an offer to acquire 1.5 million shares of Apple Corp. worth $374 per share. They offered Apple 10 million shares of Microsoft worth $25 per share, but they need to make...
Khan Academy
Khan Academy: Constant of Proportionality From Equations
Practice finding the constant of proportionality in equations.
Khan Academy
Khan Academy: Writing Proportional Equations From Tables
Practice writing proportional equations from tables.
BBC
Bbc Bitesize: Ratio
You can pick up some valuable ratio pointers here. When you finish working your way through the three instructional pages, go on to the Activity for some practice, or take an online "Test Bite" and check your understanding.
AAA Math
Aaa Math: Ratios
This short exercise gives the student a ratio in reduced terms, and then gives the students a replacement value for one part of the ratio. The student is then to input the other part of the replacement ratio so as to keep the two ratios...
CK-12 Foundation
Ck 12: Geometry: Parallel Lines and Transversals
[Free Registration/Login may be required to access all resource tools.] Apply the fact that transversals cut parallel lines proportionally.
CK-12 Foundation
Ck 12: Geometry: Forms of Ratios
[Free Registration/Login may be required to access all resource tools.] This concept teaches students what a ratio is and how to use one. Students examine guided notes, review guided practice, watch instructional videos and attempt...
CK-12 Foundation
Ck 12: Measurement: Distances or Dimensions Given Scale Measurements
[Free Registration/Login may be required to access all resource tools.] Read and interpret scale drawings and floor plans to find scale dimensions and actual dimensions
CK-12 Foundation
Ck 12: Arithmetic: Ratios
[Free Registration/Login may be required to access all resource tools.] In this lesson students write ratios to model real-world scenarios. Students examine guided notes, review guided practice, watch instructional videos and attempt...
BBC
Bbc Skillswise: Percent and Fractions: Ratio and Proportion
Activities and factsheets exploring ratios and proportions in everyday life. Interactive, colorful, and fun.
CK-12 Foundation
Ck 12: Measurement: Scale Distances or Dimensions
[Free Registration/Login may be required to access all resource tools.] Recognize unit scale as a ratio between units of measure of scale dimension to actual dimension.
CK-12 Foundation
Ck 12: Algebra: Applications Using Linear Models
[Free Registration/Login may be required to access all resource tools.] In this lesson students use problem-solving strategies and a plan to solve real-world dilemmas. Students watch a video tutorial, explore guided notes and attempt...
Rice University
Rice University: Cynthia Lanius: Golden Ratio
This site introduces students to the definition of golden ratio. It gives them a chance to estimate ratios and predict which figures are closest to the golden ratio. There is a link on this page that provides charts for students to...
CK-12 Foundation
Ck 12: Geometry: Aa Similarity (Intermediate)
[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to identify whether or not two triangles are similar using AA Similarity.
Alabama Learning Exchange
Alex: Arc Lengths and Sector Areas
Students will work in cooperative groups to discover the relationships between arc length, central angle measure, and circumference. They will also discover the relationship between circle area, central angle measures, and sector area....
Better Lesson
Better Lesson: Finals Week Day 2
Which drink has the strongest caffeine concentration? Students work on this problem for the second of two lessons.
Shodor Education Foundation
Shodor Interactivate: Image Tool
Measure angles, distances, and areas in several different images (choices include maps, aerial photos, and others). A scale feature allows the user to set the scale used for measuring distances and areas.