National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Direct and Indirect Variation
A student asks Dr. Math for help to understand the concept of direct and inverse variation. The Dr. begins with the very basics and gives a great discussion on variation. The Dr. includes the thinking process and examples.
Houghton Mifflin Harcourt
Holt, Rinehart and Winston: Homework Help Independent Practice: Direct Variation
Get independent practice working with direct variation. Each incorrect response gets a text box explanation and another try. Correct responses are confirmed.
University of Regina (Canada)
University of Regina: Math Central: Direct and Partial Variation
Students analyze and explore direct and partial variation. Comprehension is shown through solving real world problems. The two lessons have an overview, materials, procedures, and evaluation techniques.
University of Regina (Canada)
University of Regina: Math Central: Direct and Partial Variation
Students analyze and explore direct and partial variation. Comprehension is shown through solving real world problems. The two lessons have an overview, materials, procedures, and evaluation techniques.
University of Regina (Canada)
University of Regina: Math Central: Direct Variation: Real World Lesson Plan
This site contains lesson plans for a unit on direct and partial variation. It includes definitions, worked examples, exercises, and solutions.
University of Georgia
University of Georgia: Investigating Direct & Inverse Variation Telescope Act.
A lesson plan to investigate direct and inverse variation through a telescope activity. Good graphical illustrations provided.
Texas Instruments
Texas Instruments: Direct, Inverse, and Joint Variation
This set of questions pertains to direct, inverse, and joint variation. Students are asked to recognize equations of each type and to solve applications problems. Solutions and explanations are included.
Texas Instruments
Texas Instruments: Numb3 Rs: Barging In
Based off of the hit television show NUMB3RS, this lesson exposes students to equations of variation (direct, inverse, and joint) in the real world, as well as having students work with such equations in the real world context. The...
Texas Instruments
Texas Instruments: Linear Functions Using the Cbl 2
Students will generate data on the CBL 2 to represent a linear function. They will investigate the slope of a direct variation. Then they will use different starting points to represent y intercept.
Texas Instruments
Texas Instruments: An Exploration of Direct Variation and Linear Regression
Students will use this activity for the following Algebra concepts: Review of Direct Variation; Properties of direct variations; Finding the constant of variations from data sets; Find missing values in data sets both numerically and...
Other
Jiskha Math Homework Help: Direct and Indirect Variations
Jiskha.com offers math homework help that provides a general overview of direct and indirect variation, including a few simple graphing examples.
Mangahigh
Mangahigh: Algebra: Direct Proportion
Mangahigh is a website with math games aimed at twelve to eighteen year olds. On this site students form and use the formula for direct variation.
Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Inverse and Direct Variation
Twenty problems present a variety of practice with inverse and direct variation. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the "View Solution" button...
Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Joint, Direct and Inverse Variation
Twenty-nine problems present a variety of practice working with direct, inverse and joint variation. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the...
Varsity Tutors
Varsity Tutors: Hotmath: Graphing Calculator Practice Problems: Proportions
Practice using your graphing calculator for solving proportion problems. If you get stumped or if you would like to check your work, then select the View Solution button, which is located directly under each problem.
CK-12 Foundation
Ck 12: Algebra: Ratio, Proportion, and Variation
[Free Registration/Login may be required to access all resource tools.] Understand direct and inverse variation.
CK-12 Foundation
Ck 12: Algebra: Inverse Variation Models
[Free Registration/Login may be required to access all resource tools.] Graph, write, and solve inverse variations.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Direct and Inverse Variation
Dr. Math gives hints of how to solve a problem with inverse and direct variation. The site includes how inverse and direct variation problems are set up using initial and final conditions. The student can then solve for the unknown. A...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Direct and Indirect Variation
Dr. Math addresses the difference between direct and indirect variation. The Dr. gives several examples through his explanation, using real-world scenarios. The Dr. describes how problems are typically stated for indirect variation and...
Lawrence Hall of Science
The Math Page: Skill in Algebra: Variation
Here is a site that clearly and thoroughly explains direct and inverse variation. There are example problems solved, problems for the student to attempt, and answers to the student problems. Point this site out to students who have been...
CK-12 Foundation
Ck 12: Algebra: Graphs of Linear Models of Direct Variation
[Free Registration/Login may be required to access all resource tools.] Students will write, graph, and solve direct variation models for real-world problems. Students examine guided notes, review guided practice, study vocabulary, watch...
CK-12 Foundation
Ck 12: Algebra: Direct Variation
[Free Registration/Login may be required to access all resource tools.] This lesson shows you have to determine if a set of data varies directly.
CK-12 Foundation
Ck 12: Algebra: Applications Using Direct Variation
[Free Registration/Login may be required to access all resource tools.] In this lesson students learn how to solve real-world problems modeled by direct variation. Students watch a video tutorial, explore guided notes and attempt...
CK-12 Foundation
Ck 12: Algebra: Graphs of Rational Functions Study Guide
This comprehensive study guide highlights the main terms and formulas needed to understand graphs of rational functions. Examples are included.