Grades 6 - 10. Free account registration required.
Alcumus is a challenging adaptive online learning system from the Art of Problem Solving which is designed to provide additional practice to complement their textbooks and online courses. It covers pre-algebra, parts of algebra I, and other topics. Alcumus does not offer lessons, but the Art of Problem Solving (AOPS) videos can help with instruction.
Grades 8 - 12+. Free
Website: https://edready.org/
EdReady, is a free online resource to help students prepare for algebra 1, the ACT and SAT, common college entrance exams, and other goals.
Students select their goal and are given a corresponding diagnostic assessment. Based on the results of the diagnostic, EdReady creates a customized student learning path which includes video instruction, warm-up exercises, practice problems, and quizzes. Answers are scored electronically.
Students will need to register for a free account to save progress, but EdReady may be explored without an account by clicking on the "get started" button and then selecting "enter as a guest."
EdReady is not designed as a course, but many of the same instructional resources are used in the HippoCampus Algebra 1 Semester 1 and HippoCampus Algebra 1 Semester 2 courses. EdReady and HippoCampus are both provided by the the non-profit NROC Project.
Grades K - 12+. Free
Khan Academy began as a math resource by has a growing amount of content in other subject areas. It offers an extensive collection of interactive screencast tutorials as well as free, electronically-graded practice exercises. Videos are typically between three and twelve minutes in length and offer clear, direct explanations and demonstrations for how to complete math problems.
Sign up for a free account to keep track of progress.
Khan Academy does not offer placement tests or diagnostic assessments, but the "course challenge" at the end of a course could provide helpful feedback about student abilities, as well as a serve as a review of material and a way to practice for other tests.