Pre-Agebra

• Elemmentary Addition
• The Multiplication Table

1. Powers of 10
2. The Meaning of Decimals
3. Multiplying by Powers of 10; Dividing by Powers of 10 ; The Meaning of Percent
4. More Elementary Addition; Mental Arithmetic
5. Adding Whole Numbers and Decimals; Addition with Regrouping
6. The Meaning of Subtraction; Mental Arithmetic
7. Subtracting Whole Numbers andDecimals
8. The Meaning of Muliplication; Mental Arithmetic
9. Multiplying Whole Numbers, Multiplying Decimals
10. The Meaning of Division
11. Short Division
12. Dividing Decimals
13. Percent with a Calculator
14. Parts of Natural Numbers 1
15. Parts of Natural Numbers 2
16. Ratio and Proportion 1
17. Ratio and Proportion 2
18. Proportionality
19. Proper Fractions, Mixed Numbers, Improper Fractions
20. Unit Fractions
21. Equivalent Fractions
22. Comparing Fractions
23. Fractions into Decimals
24. Adding and Subtracting Fractions
25. Multiplying Fractions Dividing Fractions
26. The Meaning of Multiplying FractionsParts of Fractions
27. Percents are Ratios
28. Percent of a Number
29. What Percent? The Method of Proportions
30. Percent Increase or Decrease
31. Prime Numbers
32. Greatest Common Divisor; Lowest Common Multiple

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