1. Day Problems Name the set(s) of numbers to which each number belongs. 1.-122. 6 3. 4. 0 5. -4.8

2. Counterexample Counterexample – any example that proves a statement false

3. Using Counterexamples Is each statement true or false? If it is false, give a counterexample. a.All whole numbers are rational numbers. b.The square of a number is always greater than the number. SOLUTIONS. a.Every whole number can be written in the form n/1, so all whole numbers are rational. Statement is TRUE. b.The square of 0.5 is 0.25, and 0.25 is not greater than 0.5. This statement is FALSE.

4. Comparing Numbers An inequality – a mathematical sentence that compares the value of two expressions using an inequality symbol, such as ≤ or ≥. - greater than

5. Ordering Fractions Write and in order from least to greatest. Write each fraction as a decimal. From least to greatest, the fractions are

6. Absolute value Absolute value of a number – the distance from 0 on a number line – ALWAYS positive.

7. Finding Absolute Value Find each absolute value. 1.| 12 | = 12 2. 3. | 0 | = 0

8. More Practice!!!! Class work – textbook p. 20 - 21 #1 – 41 odd Homework – STUDY