This lesson contains a video lesson [9:28] and various exercises about the …

This lesson contains a video lesson [9:28] and various exercises about the area of rectangles, common units of area, two-part rectangles and the distributive property, and shapes composed of rectangular areas.

This lesson presents the idea that the area of any triangle is …

This lesson presents the idea that the area of any triangle is exactly half of a certain parallelogram -- thus we get the familiar formula of multiplying the base and the altitude and taking half of that. The lesson contains varied exercises for students.

This lesson teaches how to add like fractions and mixed numbers with …

This lesson teaches how to add like fractions and mixed numbers with like fractional parts using visual models (pies, fraction bars). It includes lots of exercises.

This fifth-grade lesson teaches how to add and subtract unlike fractions using …

This fifth-grade lesson teaches how to add and subtract unlike fractions using a video presentation and visual models. [7:19] Includes practice exercises.

This review lesson about basic shapes (polygons)contains varied hands-on exercises and tilings …

This review lesson about basic shapes (polygons)contains varied hands-on exercises and tilings about triangles, quadrilaterals, pentagons, and hexagons.

In this lesson, fraction divisions are solved by thinking how many times …

In this lesson, fraction divisions are solved by thinking how many times the divisor "fits" or "goes into" the dividend. Includes video, visual models, and word problems. [10:32]

In this lesson, learn how to divide fractions using the shortcut of …

In this lesson, learn how to divide fractions using the shortcut of reciprocal numbers which is shown in the accompanying video. [10:31] The lesson also includes practice problems and many word problems.

Lesson teaches the concept of equivalent fractions. Accompanying video shows how to …

Lesson teaches the concept of equivalent fractions. Accompanying video shows how to get an equivalent fraction by splitting the existing pieces further into a certain number of new pieces.

This fifth-grade lesson explores the area of a rectangle with fractional side …

This fifth-grade lesson explores the area of a rectangle with fractional side lengths. We tile the rectangle with unit rectangles and show that the area is the same as would be found by multiplying the side lengths. We multiply fractional side lengths to find areas of rectangles.

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