1. Objectives Chapter 5 Define percent
Convert among percent, fraction, and decimal numbers
Set up percent problems using the percent formula
Use proportion to solve percent problems
Calculate percent change
Solve single trade discount problems
Calculate percent strength problems
Compare percents that have fractions and decimals

2. Percents
Knowledge of percents in health care will help students understand the percent strength of solutions for patient medications, interest on loans and taxes, and discounts and markups in pharmacies and retail stores. In addition, medical insurance and accounts receivable departments use percentages regularly to determine what portion of an invoice is covered as well as to calculate preferred provider versus out-of-program provider rates and coverage. In general, though, general health care professionals see percent applications less frequently than fraction and decimal applications.
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3. Percents Overview Pages 128 – 129
Percents are another example of a part-to-whole relationship in math. Percents are parts of one hundred & are represented by the % sign. Percents can be written as fractions: 35/100
Knowledge of percents in health care will help you understand the percent strength of solutions for patient medications, interest on loans and taxes, and discounts and mark-ups in pharmacies and retail stores.
In addition, medical insurance and accounts receivable departments use percentages regularly to determine what portion of an invoice is covered as well as to calculate preferred provider versus out-of-program provider rates and coverage.
In general, percent application are seen less frequently than fractions & decimals by general health care professionals.

4. Percent-to-Decimal Conversion
Page 129
Percent-to-Decimal Conversion
To convert a percent to a decimal, shift the decimal point two places to the left.
The process of doing this quick division replaces have to divide the number by 100.
Examples – page 129 – Practice 1: Evens
group work – page 129 – Practice 1: odds

5. Decimal-to-Percent Conversion
Page 130
Decimal-to-Percent Conversion
To convert a decimal to a percent, shift the decimal point two places to the right.
If a number has a decimal in it and you are converting from a decimal to a percent, use the existing decimal point as the starting point for the conversion.
It is possible to have percents greater than 100.
Examples – page – Practice 2-3: Evens
group work – page – Practice 2-3: odds

6. Using Proportion to Solve Percent Problems
Pages 131 – 132
Using Proportion to Solve Percent Problems
Proportions are also very useful in solving percent problems. To accomplish this, use the formula: %
100
is (the part)
of - whole (the total) =
Examples – page – Practice 4: Evens
group work – page – Practice 4: odds

7. Percent Problems in Health Care
Page 133
Percent Problems in Health Care
To solve percent problems in health care, one needs to be aware that the problem may include whole numbers, fractions, and decimals.
The skills used in percents draw on the foundation you have in these areas of math computation.
It is important to remember and apply the fraction concepts learned when dealing with fractions in percents because a fraction is more accurate and exact than a decimal number that has a repeating final digit.
Examples – page 134 – Practice 5: Evens
group work – page 134 – Practice 5: odds

8. Complex Percent Problems
Page 134
Complex Percent Problems
More complex percents include fractions, and the most efficient way of handling these percents is as complex fractions.
By setting up the problem in proportion format, the work is put into manageable steps.
A common error that students make is to multiply the first two numbers and consider their work done; however, there is always a final division step that must be performed.
Examples – page 135 – Practice 6: Evens
group work – page 135 – Practice 6: odds

9. Page 136
Percent Change
Change is ever present in our lives. A percent change can represent an increase or a decrease. We calculate present change for fees, medical doses, weight, income, and so on. You may use a simple formula to help determine percent change.
Set up the fraction of change
Use proportion to set up a percent conversion. Remember that percent means out of 100.
Amount of change
Original number =
Fraction of change
Examples – page – Practice 7: Evens
group work – page – Practice 7: odds

10. Percent Strength of Solutions
Page 137
Percent Strength of Solutions
The strength of solutions is an important application of percents.
Solution = a liquid that has had medication, minerals, or other products dissolved in it. It refers to a two-part substance:
Solute – the drug, mineral, or product (can be dry – in grams or liquid – in liters)
Solvent – the liquid (can consist of a variety of mediums depending on the medical application)
Percent strength = how much of a substance has been dissolved in a specific amount of liquid.
Key to percent strength is your knowledge of part-to-whole relationships: A percent is x parts to 100 total parts.
***
Examples – page 138 – Practice 8: Evens
group work – page 138 – Practice 8: odds

11. Using Proportion to Convert Solutions
Page 139
Using Proportion to Convert Solutions
Knowledge of proportion is useful in converting to smaller or larger amounts of solution. In health care, professionals may not always require 100 mL of solution.
It is important to maintain the correct ratio or pure drug to solution to ensure that the patient is getting the medication or solution the doctor intended.
Note that the ratio of pure drug remains consistent no matter how much solution is to be prepared.
Examples – page – Practice 9-10: Evens
group work – page – Practice 9-10: odds

12. Single Trade Discount Page 141
Single trade discounts are useful to individuals who handle products or inventory that must be marked up.
The single trade discount provides the net price of items when a single discount has been given.
Some health care organizations that use certain name brands receive these discounts from manufacturers of the products they use or sell most often.
Examples – page 142 – Practice 11: Evens
group work – page 142 – Practice 11: odds