Transcript Day Problems • Name the set(s) of numbers to which each number belongs. 1.

Day Problems
•
Name the set(s) of numbers to which each number
belongs.
1. -12
2. 6
3.
5
12
5. -4.8
4. 0
Counterexample
• Counterexample – any example that
proves a statement false
•
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.
Comparing Numbers
• An inequality – a mathematical sentence
that compares the value of two
expressions using an inequality symbol,
such as ≤ or ≥.
• < - less than, > - greater than
Ordering Fractions
• Write
3
1
 ,  ,
8
2
5
and 
12
in order from least to
greatest.
• Write each fraction as a decimal.
3
  0.375
8
5
  0.416
12
1
  0.5
2
• From least to greatest, the fractions are
5
1
 ,  , 3
12
2
8
Absolute value
• Absolute value of a number – the distance
from 0 on a number line – ALWAYS
positive.
Finding Absolute Value
• Find each absolute value.
1. | 12 | = 12
2. 2
2

3

3
3. | 0 | = 0
More Practice!!!!
• Class work – textbook p. 20 - 21 #1 – 41
odd
• Homework – STUDY