Sophia Learning
Sophia: Using Order of Operations
This lesson will explain the rules regarding order of operations and present the situations in which knowing the order of operations becomes necessary.
AAA Math
Aaa Math: Fraction Parts Eighths
This lesson describes eighths and gives practices and games identifying various amounts of eighths. Also shows other fractions visually.
Wyzant
Wyzant: Perfect Square List
WyzAnt provides a list of numbers and their squares. The user decides how many perfect squares to be displayed and in what fashion. The table makes a good reference sheet for students and teachers.