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National Council of Teachers of Mathematics
Nctm: Illuminations: Pan Balance Numbers
Use this tool to find out if expressions are equal to each other. If the pan balance levels out then the expressions are equal.
National Council of Teachers of Mathematics
Nctm: Illuminations: Pan Balance Shapes
Use this virtual, double pan balance and explore what shapes and amounts of shape balance each other. Great introduction to beginning algebra concepts.
Math Is Fun
Math Is Fun: Balance When Adding and Subtracting
An interactive scale shows you how to deal with numbers and variables when solving simple algebraic equations.