8.1.1 Rational Numbers
8.1.2 Add and Subtract Rational Numbers
8.1.3 Multiply Rational Numbers
8.1.4 Divide Rational Numbers
8.1.MCC
8.1.5 Compare Rational Numbers
8.1.6 Percent Proportion and Percent Equation
8.1.7 Discount, Markup, and Sales Tax
8.1.8 Interest
8.1.9 Percent of Change
8.1.CR