Sal estimates lengths using units of inches, feet, centimeters, and meters. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video tutorial, or receive hints.

In this video segment from Cyberchase, Inez estimates whether she has enough jelly beans in her large container to decorate all of the cookies in her batch.

Practice estimating the mass of real life objects using grams and kilograms. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

More challenging practice problems where you round whole numbers to the nearest hundred or thousand Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Sharpen your logic and angle recognition skills by working on this interactive challenge. Solution available.

Practice reading and writing numbers written in expanded form. Example: The expanded form of 376 is 300 + 70 + 6. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Recognize that in a multi-digit whole number, a digit in one place represents ten times what it represents in the place to its right. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video...

A practice quiz where students must choose the appropriate metric unit and amount to estimate the volume of each object. Includes hints.