Interactive
Calculator Soup

Calculator Soup: Ratio Calculator

For Students 9th - 10th
The ratio calculator performs three types of operations and shows the steps to solve. It simplifies ratios or creates an equivalent ratio when one side of the ratio is empty, solves ratios for the one missing value when comparing ratios...
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Houghton Mifflin Harcourt

Houghton Mifflin Harcourt: Saxon Activity Center: Graphing Calculator Activity: Proportions [Pdf]

For Students 9th - 10th
A concise graphing calculator lesson on proportions. Detailed examples, demonstrations of functions, and practice problems included. Acrobat Reader required.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 6.g Painting a Barn

For Teachers 6th Standards
This task asks students to determine the area of the exterior walls of a barn and to calculate how many gallons of paint would be needed to cover them, as well as the cost of the paint. Aligns with 6.G.A and 6.RP.A.3.
Unit Plan
Khan Academy

Khan Academy: Discount, Tax, and Tip Word Problems

For Students 6th - 8th Standards
Practice solving word problems involving price discounts, taxes, and tip calculations. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Activity
Wyzant

Wyzant: Proportion Basics

For Students 9th - 10th Standards
WyzAnt provides an explanation and examples on solving proportions. Proportions practice problems and a proportion calculator are included in this lesson.
Unit Plan
Mangahigh

Mangahigh: Number: Percent Increase and Decrease Calculator

For Students 6th - 8th Standards
Students learn about the concept of percent change by exploring a tutorial. They can then test their knowledge by taking a ten question assessment that increases in difficulty as they correctly answer questions.
Website
Virtual Nerd

Virtual Nerd: How Do You Solve a Word Problem Using Unit Rates?

For Students 6th - 8th Standards
Word problems allow you to see the real world uses of math! This tutorial shows you how to take a rate and convert it to a unit rate. Then, you can use that unit rate to calculate your answer. Watch this tutorial to learn all about it!