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Product Description Don't tip the scales! Number Balance is a T-shaped scale that visually demonstrates equivalents to help students understand number relationships and operations, such as addition, subtraction, and comparisons, as well as pre-algebra concepts. Includes scale, 20 balance weights, and teacher’s guide. From the Manufacturer Number Balance is a T-shaped scale with 20 weights that visually demonstrates number relationships and operations, such as addition, subtraction, and comparisons, as well as pre-algebra concepts. It’s the easy, visual way to learn equivalents. Set includes scale, 20 balance weights, and teacher’s guide.