Ratio errors confuse one of the coaches in an epic dodgeball tournament.

Addresses: Ratios can represent part-whole or part-part relationships.

This humorous animation visualizes the ratio of words spoken on a series of dates.

Addresses: Proportions as multiplicative situations. Proportional relationships can be related to a common rate in direct variations.

A passionate activist clarifies equality on a number line.

Addresses: Equality and order on the number line. Number line properties.

Rulers value proper units and proportional details.

Addresses: Various techniques are helpful in solving proportion, including tables, graphs, measurement, and equations. Given an application problem, using the units can help to set up the correct proportion. When proportions are graphed on a coordinate plane, the graph is linear.

Pearl Diver addresses number and operations standards - such as number line sense, whole numbers, decimals, mixed numbers and fractions - as established by the National Council of Teachers of Mathematics (NCTM).

Addresses: Equality and order on the number line Number line properties

A crusading superhero clarifies and uses scale factor.

Addresses: Objects that are scale representations of each other have the same shape but not the same size, and the size difference is related to the scale factor.

Math Snacks Video Player includes all available Math Snacks animations.

You're the driver! Fit as many of the little monsters as you can on the bus and drive them to monster school! But there's something odd about the neighborhood...

Addresses: Multiple representations of numbers. Visualize numbers as sets and quanitities. Use base-ten representation.

He pops up when you least expect him. And he can't resist pointing out the rates and "purrportions" in daily life.

Addresses: Comparison of two quantities measured in different units. Establish the relationship between the two units.