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 Cyberchase video segment, the CyberSquad estimates how much air supply they will need to complete an underwater mission.

Practice rounding 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.

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.

Solve word problems by rounding whole numbers. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

If you're a popcorn lover, you might want to take this math challenge. A real-world challenge on visually estimating volume of popcorn containers. A one page activity from the NCTM Math for Families collection. Life skill applications...

Try this probability challenge from the NCTM Math Challenges for Families series. See if you can figure out the probability of putting three checks in the correct envelopes without looking. Also, discover how probability skills are used...

Students will use a variety of activities and games to learn how to round numbers.This lesson plan was created as a result of the Girls Engaged in Math and Science, GEMS Project funded by the Malone Family Foundation.

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

Do people with big hands have larger angles between their fingers? See if you can find the answer this question when you try this math challenge on estimating and measuring angles. Discover how understanding angles and geometric shapes...

[Free Registration/Login Required] This flipchart is a review for the Georgia CRCT covering fractions and estimating.

Here's a delicious math challenge for chocolate lovers! Use your estimation and measurement skills to discover which irregular shaped, chocolate covered cookie has the largest surface area. A one-page activity from the NCTM Math...

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.

Measure the lengths and diagonals of three squares with a ruler. Look over your measurements and try to come up with a rule of thumb for estimating the length of a diagonal if you know the length of a side.

To figure out who won the race you have to compare their times. This interactive exercise focuses on using what you know about ordering decimals, number lines and rounding to the tenths place and then asks you to think about what numbers...

Geometry is the study of how to use math to describe and investigate different points, lines and shapes. The way that a shape is described in geometry is with a formula, which is simply a mathematical way to calculate different...