1. Combined Operations with Decimal Fractions
Unit 16
Combined Operations with Decimal Fractions

2. Basic Principles of Combined Operations with Decimal Fractions
Follow the rules for addition, subtraction, multiplication, and division of decimal fractions to solve problems that combine operations with decimal fractions.

3. Basic Principles of Combined Operations with Decimal Fractions
The first step in solving these problems is determining which operations are needed and in what order.
Do the math necessary to solve the problem.
Round off as directed.

4. Combined Operations with Decimal Fractions
Example:
Solve
Round off answers to three places or thousandths.

5. Combined Operations with Decimal Fractions
Solve within parentheses first:

6. Combined Operations with Decimal Fractions
Finish the operations outside the parentheses: =

7. Practical Problem
A registered nurse (RN) working in the operating room earns $ for a 40-hour week. A certified surgical technician (CST) earns $ for a 40-hour week.
What is the cost of labor for a 3 1/2-hour surgery if one RN and two CSTs are assisting?

8. Practical Problem First find the hourly rate for the RN:
Find the hourly rate for the CST:

9. Practical Problem
Now figure out how much the RN and two CSTs would earn in 3.5 hours:
RN: – CSTs:
The RN and CSTs:
The total cost of labor is $