Number Theory and Fraction Concepts     Lesson 3-1 Factors, Multiples, and Divisibility Lesson 3-2 Prime and Composite Numbers Lesson 3-3 Greatest Common Factor Lesson 3-4 Least Common Multiple Lesson 3-6 Understanding Fractions Lesson 3-7 Equivalent Fractions Lesson 3-8 Improper Fractions and Mixed Numbers Lesson 3-9 Estimating Fractional Amounts Lesson 3-10 Connecting Fractions and Decimals Lesson 3-11 Comparing and Ordering Fractions and Decimals