Use this unique balance to physically show the sum of an integer and its additive inverse is zero. Weights placed in outer pans represent negative integers, and those placed in inner pans represent positive integers. Ideal for small-group work, the balance can be used to solve linear equations, build identities, and model systems of linear equations. The sturdy, 17" plastic balance comes with four plastic pans, a set of plastic weights, four plastic canisters, and an instructional booklet.
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