Activity
Wyzant

Wyzant: Proportion Calculator

For Students 9th - 10th Standards
Students enter problems into a proportion calculator to see the solutions. The calculator solves proportions using cross product properties.
Activity
Shmoop University

Shmoop: Ratios & Percentages: Ratios & Proportions

For Students 9th - 10th Standards
Students learn about ratios and percentages in the tutorial. The mathematics resource consists of examples and practice problems with answers.
Activity
Shmoop University

Shmoop: Ratios & Percentages: Solving Proportions

For Students 9th - 10th Standards
Students learn how to solve proportions. The mathematics resource consists of examples and practice problems with answers.
Handout
Purple Math

Purplemath: Proportions: Introduction

For Students 6th - 8th Standards
Explains the basics and terminology of proportions.
Website
Ducksters

Ducksters: Kids Math: Ratios, Fractions, and Percentages

For Students 3rd - 8th Standards
This page explores how ratios can be written as fractions. The site also discusses proportions and reducing ratios with problems and examples.
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Algebra Review: Proportions

For Students 9th - 10th Standards
Find a quick, concise explanation of proportions. An example is given and clearly explained.