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In this math lesson, learners are introduced to proportional reasoning through modeling, sharing, and questioning techniques.

In this math lesson, learners use fruit to learn about proportions and percentages. Learners compare the weights of the edible and non-edible portions of fruit.

Choose a recipe to double (or triple, quadruple, or halve). Show everyone the recipe and engage them in figuring out: How much will we need to increase the recipe to feed everyone?

This is an activity (on page 2 of the PDF under Surface Area Activity) about surface area to volume ratio.

This game teaches ratio and proportion by having learners make "salads" that combine three types of beans in different combinations.

In this math lesson, learners apply the concepts of ratio and proportion to the capture-recapture statistical procedure.

In this math lesson, learners apply the concepts of ratios and percentages to the distribution of letters contained in a box of Alphabits® cereal.