University of Waterloo (Canada)
Centre for Education in Mathematics and Computing: Ratio and Rate [Pdf]
Learners explore the concepts of rate and ratio in a variety of problem-solving situations. Worksheets contain definitions and visual representations of concepts. Link to related ratio game. Other skills include measurement, data...
Other
Help With Fractions: Multiplying Fractions
The rules for multiplying fractions are clearly explained at this website. This is an excellent place to get step by step explanations for working with fractions.
Khan Academy
Khan Academy: Reducing Rational Expressions to Lowest Terms
Learn what it means to reduce a rational expression to lowest terms, and how it's done!
Khan Academy
Khan Academy: Intro to Rational Expressions
This lesson will introduce you to rational expressions. You will learn how to determine when a rational expression is undefined and how to find its domain.
University of Cambridge
University of Cambridge: Nrich: Games Pelmathism: Fractions, Decimals, & Percents
Use this game to improve your knowledge and understanding of fractions, decimals, and percents. You can set the topics you want to practice on this game.
Curated OER
Educational Technology Clearinghouse: Clip Art Etc: Aries
The battering-ram, was used to batter down the walls of besieged cities. It consisted of a large beam, made of the trunk of a tree, especially of a fir or an ash. To one end was fastened a mass of bronze or iron, which resembled in its...