National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: High School Basic Algebra Review
An overview of basic high school algebra topics can be found here. Absolute value, signed numbers, inequalities and equations, mixture problems, and direct and indirect variation are all listed, each with links to questions posed by...
Calculator Soup
Calculator Soup: Ratio Simplifier
Use this calculator to simplify ratios of the form A : B. A or B can be whole numbers, integers, decimal numbers, fractions or mixed numbers. They can be different types, for example, one fraction and one decimal. The ratio values can be...
Calculator Soup
Calculator Soup: Math Equation Solver
Solve math problems using order of operations like PEMDAS, BEDMAS and BODMAS. This calculator solves math equations that add, subtract, multiply and divide positive and negative numbers and exponential numbers. You can also include...
ClassFlow
Class Flow: Pre Algebra Problem Solving
[Free Registration/Login Required] This flipchart contains manipulatives for creating addition and subtraction problems using positive and negative numbers. There is an example problem which teachers can use to help design their own...
Calculator Soup
Calculator Soup: Fractions Average Calculator
This calculator finds the average of a set of fractions by adding all of the fractions and dividing by the number of fractions in the set. Enter positive or negative fractions, integers and mixed numbers and the calculator converts...