 Color Chips (NLVM)
This applet is an eversion of the chip model for integer arithmetic. Positive and negative chips or pairs of chips can be dragged to and from a workspace to model addition or subtraction.
 TeacherCreated.com
This link takes the user to a lesson plan titled "Interesting Integers" and is used as an introductory lesson on adding and subtracting integers. The plan includes links to websites for student practice, as well as printable activity sheets with answers.
 Teaching exponents
This page is a lesson plan used to teach the concepts of exponents. The lesson plan effectively uses unit cubes having "birthdays" to illustrate what exponents mean, as well as how to correctly name and write them.
 Teaching rational numbers
This page is a good resource for teachers when teaching about rational numbers. The notes and colorful representations give teachers good examples of how to demonstrate rational numbers to students through pictures and models.
 The Evolution of Real Numbers
This is an interesting description of many topics that lead up to the definition and exploration of the real number system. Although mostly text, the pages are filled with interactive questions and useful information that is not too technical.
 The Image of Rational Numbers in Students
This link takes the user to a brief, but interesting research study conducted on "The Image of Rational Numbers in Students." The study is a good example of how important early, and correct, teaching of rational numbers can be on the future knowledge of students.
 TicTacGo (Freudenthal Institute)
This applet provides simple drill of integer arithmetic.

