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Addition and Subtraction with Significant Figures

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PreAlgebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Prealgebra. You're about to play with the professionals. Think of prealgebra as a runway. You're the airplane and algebra is your sunny vacation destination. Without the runway you're not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We're about to take off!

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