Unit 16 Combined Operations with Decimal Fractions.

Unit 16

Combined Operations with Decimal Fractions

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.

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.

Combined Operations with Decimal Fractions

• Example: Solve

–Round off answers to three places or thousandths.

Combined Operations with Decimal Fractions

• Solve within parentheses first:

Combined Operations with Decimal Fractions

– Finish the operations outside the parentheses:

0.087 + 8.004 =

Practical Problem

• A registered nurse (RN) working in the operating room earns $980.80 for a 40-hour week. A certified surgical technician (CST) earns $747.20 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?

Practical Problem

• First find the hourly rate for the RN:

• Find the hourly rate for the CST:

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 $216.58.