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Algebra.com: Homework Solvers
This site offers both instruction and homework help in several algebraic topics, including topics within Pre-Algebra, Algebra I, and Algebra II.
ClassFlow
Class Flow: Applications Using Systems
[Free Registration/Login Required] This flipchart provides guided practice with word problems involving systems of equations and gives a brief review on solving systems of equations.
National Council of Teachers of Mathematics
The Math Forum: A Collection of Secondary Math Units
Teachers of grades 9-12 can explore these seven math units for their classes. Data collection and analysis, problem solving with spreadsheets, and linear transformation are just a few of the topics covered here.
Khan Academy
Khan Academy: Sums of Consecutive Integers
Practice finding the nth number in a sequence of consecutive numbers based on the sum. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.