1. 0-4 Adding and subtracting rational numbers
Goals:
Compare and order rational numbers.
Add and subtract rational numbers.

2. Vocabulary Numerator – top number in a fraction
Denominator – bottom number in a fraction

3. Comparing and Ordering Rational Numbers
Two methods:
Get a common denominator.
Example: 𝑎𝑛𝑑 5 6
Turn fractions into decimals.
Example: 𝑎𝑛𝑑 5 8

4. Examples < > < Replace the blank space with <, >, or =.
3 5 ___ 7 9
4 7 ____0.55
− _____−5.5
<
>
<

5. Examples Order the numbers from least to greatest.
5 2 9 , , 𝑎𝑛𝑑 −5 3 5
−5 3 5 , 4.9, ,
3 3 8 , −3 3 7 , 𝑎𝑛𝑑 −3 2 5
−3 3 7 , −3 2 5 , , 3.45

6. Adding and Subtracting Fractions
Two methods:
Get a common denominator and add or subtract numerators.
Example:
Use a calculator.
Example:

7. IMPORTANT!!! Things to remember when using a calculator:
Fractions should ALWAYS be in parenthesis
Mixed numbers are put in as an addition problem
To get a fraction for an answer press:
MATH >FRAC

8. Adding and Subtracting Decimals
Two methods:
Line up decimals and add or subtract.
Use a calculator.

9. Examples Find each sum or difference. 3 5 + 1 5 3 8 − 1 3 4 5 + 7 10
2 5 − 3 4
4 5
1 24
1 1 2
− 7 20

10. Examples -12.6 + (-3.9) -16.5 2.5 – (-3.5) -32.25 – (-42.5) 6
– (-24.5)
-16.5 6
10.25
6.95

11. Practice
Page P16 #11-25 odd

12. Homework
Page P16 #2-40 even