Video 1. What Is a Number System?
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Video 2. Number Sets, Infinity, and Zero
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Video 3. Place Value
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Video 4. Meanings and Models for Operations
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Video 5. Divisibility Tests and Factors
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Video 6. Number Theory
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Video 7. Fractions and Decimals
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Video 8. Rational Numbers and Proportional Reasoning
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Video 9. Fractions, Percents, and Ratios
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Video 10. Classroom Case Studies, K-2
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Video 11. Classroom Case Studies, 3-5
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Video 12. Classroom Case Studies, 6-8
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