This short video and interactive assessment activity is designed to teach fourth graders about finding the number from figure patterns.

This short video and interactive assessment activity is designed to teach fifth graders about finding the reciprocal of fractions.

The CyberSquad has to find a crystal that is between 65% and 85% orange to power up their escape from Hacker in this video from Cyberchase.

This short video and interactive assessment activity is designed to teach fourth graders about finding the total time given a distance between two objects.

This short video and interactive assessment activity is designed to teach fifth graders about finding the total time given a distance between two objects.

This short video and interactive assessment activity is designed to teach fifth graders about finding the total using division - word problems.

This task asks students to solve addition and subtraction equations with different structures so that they are able to see the connections between addition and subtraction more easily.

This short video and interactive assessment activity is designed to teach fifth graders about determining rate.

This short video and interactive assessment activity is designed to teach fourth graders about determining rate.

This learning video presents an introduction to the Flaws of Averages using three exciting examples: the ''crossing of the river'' example, the ''cookie'' example, and the ''dance class'' example. Averages are often worthwhile representations of a set of data by a single descriptive number. The objective of this module, however, is to simply point out a few pitfalls that could arise if one is not attentive to details when calculating and interpreting averages. The essential prerequisite knowledge for this video lesson is the ability to calculate an average from a set of numbers. During this video lesson, students will learn about three flaws of averages: (1) The average is not always a good description of the actual situation, (2) The function of the average is not always the same as the average of the function, and (3) The average depends on your perspective. To convey these concepts, the students are presented with the three real world examples mentioned above.

The purpose of this task is to provide students with a concrete experience they can relate to fraction multiplication. Perhaps more importantly, the task also purposefully relates length and locations of points on a number line, a common trouble spot for students. This task is meant for instruction and would be a useful as part of an introductory unit on fraction multiplication.

This short video and interactive assessment activity is designed to teach fourth graders about forming largest and smallest numbers (includes even and odd).

This short video and interactive assessment activity is designed to give fourth graders an overview of the time challenge ii lesson.

Match shapes and numbers to earn stars in this fractions game. Challenge yourself on any level you like. Try to collect lots of stars! The main topics of this interactive simulation include fractions, equivalent fractions, and mixed numbers.

Match shapes and numbers to earn stars in this fractions game. Challenge yourself on any level you like. Try to collect lots of stars! The main topics of this interactive simulation include fractions, equivalent fractions, and mixed numbers.

This short video and interactive assessment activity is designed to teach fifth graders about the conversion of fractions to decimals.

Explore fractions while you help yourself to 1/3 of a chocolate cake and wash it down with 1/2 a glass of orange juice! Create your own fractions using fun interactive objects. Match shapes and numbers to earn stars in the fractions games. Challenge yourself on any level you like. Try to collect lots of stars!

Explore fractions while you help yourself to 1/3 of a chocolate cake and wash it down with 1/2 a glass of orange juice! Create your own fractions using fun interactive objects. Match shapes and numbers to earn stars in the fractions games. Challenge yourself on any level you like. Try to collect lots of stars!

This short video and interactive assessment activity is designed to teach fifth graders about fractions with common denominators - word problems.