Day 5 Problems 91307

1
Day 5 Problems 9/13/07

• Name the set(s) of numbers to which each number
  belongs.
• -12 2. 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.
• All whole numbers are rational numbers.
• The square of a number is always greater than the
  number.
• SOLUTIONS.
• Every whole number can be written in the form
  n/1, so all whole numbers are rational.
  Statement is TRUE.
• 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 .
• lt - less than, gt - 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.
• 12 12
• 2.
• 3. 0 0

8
More Practice!!!!

• Class work textbook p. 20 - 21 1 41 odd
• Homework STUDY