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Reference: Number and Language in Math
Numbers II: Measurement and Reals
Real Numbers, Arithmetic, and Estimation
Reals Satisfy Intuitive Properties
Size, Ordering, Inequalities, and Estimation
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Transitivity, Etc. of Ordering
Inequalities and Absolute Values with Sums
Inequalities and Absolute Values with Products
Scientific Notation and (Fermi/Order) Estimation
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