Rates and Ratios

Inspire mathematicians to see how ratio concepts can be used to plan a class bash! They determine which candy is the best deal. They alter a recipe to produce enough baked treats. They select the most cost-effective contents for a goodie...

Who doesn't love Shrinky Dinks projects? Use them in your math class to teach how to derive a constant of proportionality. Learners take measurements on pre-shrunk plastic forms, and after heating, measure again. They use before and...

Find here a complete lesson dealing with the equations and graphs of proportional relationships, as well as what each individual point on such a graph represents. It may appeal to girls in particular, as the data details the growth rates...

The language of rates and ratios forms a common thread through this wide-reaching main problem set and its accompanying support work. Learners mix paint, size copies, distribute candy, and shop for good deals throughout these problems....

Upper elementary and middle school pupils fill out a chart creating six equivalent fractions and then compare them to six different objects and/or shapes. They group together 16 various terms related to ratios and proportions. Pupils...

Middle school mathematicians get their turn at home ownership as they track down leaky faucets in this activity on proportional reasoning. Throughout the activity and its provided scaffolding worksheets, learners use equivalent ratios...

Revisit the 2012 Summer Olympics by having seventh graders calculate the unit rate sprinting speed of the 100-meter gold medal winner. 

Do these items have the same ratio? Through a learning contract, pupils master proportions by practicing proportions via word problems, graphs, and with manipulatives. An exit ticket checks for understanding at the end of the...

Is it possible that 8:4, 8/4, and 8 to 4 all mean the same thing? Young mathematicians explore the idea of a ratio. They then use their understanding of equivalence to solve for an unknown value in proportion. 

Converting units are ratios in disguise and can be easy solve. Although this video is the last in a series about different methods to solve ratio problems, it does not have to be used in conjunction with this series. It introduces the...