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.
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