1.1. Numbers
1.2. Axioms for algebraic operations on numbers
1.2.1. Addition and multiplication
1.2.2. Subtraction and division
1.3. Properties of numbers
1.3.1. Order properties
1.3.2. Absolute value
1.4. Exponentiation of real numbers
1.5. Factors, primes and composite numbers
1.6. Order of operations
1.7. Solved problems