This site provides students practice with the concept of mental addition. Students can learn about the topic by completing an interactive tutorial. Students can then take a ten question timed test to practice the skill.

[Free Registration/Login Required] Use this flipchart as a review of adding, subtracting and rounding larger numbers. Practice after the concept has been taught.

It is common for students to compare multi-digit numbers just by comparing the first digit, then the second digit, and so on. This task includes three-digit numbers with large hundreds digits and four-digit numbers with small thousands...