1. 3
Chapter
Chapter 2
Fractions and Mixed Numbers

2. Adding and Subtracting Unlike Fractions
Section
3.5
Adding and Subtracting Unlike Fractions

3. Add or Subtract Unlike Fractions.
Objective A
Add or Subtract Unlike Fractions.

4. Adding Unlike Fractions
Adding or Subtracting Unlike Fractions
Step 1: Find the least common denominator (LCD) of the fractions.
Step 2: Write each fraction as an equivalent fraction whose denominator is the LCD.
Step 3: Add or subtract the like fractions.
Step 4: Write the sum or difference in simplest form.
Objective A

5. Example Add: Step 1: The LCD of the denominators is 15. Step 2:
Step 4: The answer is in simplest form.
Objective A Continued

6. Example
Add:
The LCD of the denominators is 24.
Objective A Continued

7. Example
Add:

8. Example Subtract: The LCD of the denominators is 33.
Objective A Continued

9. Example
Subtract: The LCD of the denominators 3 and 11 is 33.

10. Example
Find: The LCD of the denominators 8, 3 and 12 is 24.

11. Write Fractions in Order.
Objective B
Write Fractions in Order.

12. Comparing Fractions Insert > or < to form a true sentence.
Objective A

13. Comparing Fractions Insert > or < to form a true sentence.
Objective A

14. Evaluate Expressions Given Fractional Replacement Values.
Objective C
Evaluate Expressions Given Fractional Replacement Values.

15. Evaluating Fractions Evaluate x + y for x = and y =
Replace x with and y with in x + y.
Objective B

16. Solve Problems by Adding or Subtracting Unlike Fractions.
Objective D
Solve Problems by Adding or Subtracting Unlike Fractions.

17. Example
A freight truck has 1/4 ton of computers, 1/3 ton of televisions, and 3/8 ton of small appliances. Find the total weight of its load.
To find the total weight, add the weights of the individual items.
Objective A Continued