1. R1.1 REAL NUMBERS ORDER AND ABSOLUTE VALUE

2. Set – A collection of objects Sub-set – Some of the items in the set

3. RATIONAL NUMBERS Numbers that can be written as a quotient of two integers No zeros allowed in the denominator Numbers that can be written as decimals that either terminate or repeat

4. INTEGERS {… -3, -2, -1, 0, 1, 2, 3 …}

5. NATURAL NUMBERS {1, 2, 3, 4 …} Numbers that are used for counting

6. IRRATIONAL NUMBERS Numbers that cannot be written as a quotient of two integers Decimals that do not terminate and do not repeat

7. PRACTICE

8. ABSOLUTE VALUE

9. INEQUALITIES Inequality tells you about the relative size of two values. Sentences containing, ≤, ≥, or ≠

10. Ex.: x < 0 represents the set of all numbers less than zero Inequality Notation: Number Line: Interval Notation:

11. Ex.: x ≥ 5.6 represents the set of all numbers greater than or equal to 5.6. Inequality Notation: Number Line: Interval Notation:

12. PRACTICE Give a verbal description and the interval notation of the subset of real numbers that is represented by the inequality, and sketch the subset on the real number line. 1.x < 2 2.0 ≤ x ≤ 5