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# Basic Math Skills Review - PowerPoint PPT Presentation

Basic Math Skills Review. Percents. Percent. Percent (from per centum ) means per hundred or divide by one hundred. The “%” sign is used to show the number of parts per one hundred parts.

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### Basic Math Skills Review

Percents

• Percent (from per centum) means per hundred or divide by one hundred. The “%” sign is used to show the number of parts per one hundred parts.

• There is a relationship among decimals, fractions and percents. The percent sign is equivalent to the following:

Changing a fraction to a decimal

Divide the numerator by the denominator.

Changing a decimal to a fraction

Drop decimal and divide by the highest place value.

Simplify, if possible.

Changing decimal to percent

Multiply by 100 and attach percent sign. It’s the same as moving the decimal 2 places to the right. 0.375 = 37.5%

Changing from percent to decimal

Divide by 100. It’s the same as moving the decimal 2 places to the left. 38% = 0.38

Changing percent to fraction

Drop % sign and divide by 100. Simplify if possible.

Changing from a fraction to a percent

Multiply by 100 and attach a % symbol.

Percentage = Percent x Whole Quantity

To find a percentage or part of a whole quantity:

• Change the percent to a decimal, and

• Multiply the decimal by the whole quanity.

A patient reports that he drank 75% of his eight ounce cup of coffee. How much coffee did he drink?

1) Change 75% to a decimal: 75% → 0.75

2) Multiply 0.75 x 8 ounces to get 6 ounces.

• “is” means equals

• “of” means multiply

• “what” is the unknown whole quantity.

1) What is 20% of 75? X = 0.20 x 75

2) Ten is what percent of 15? 10 = p x 15

3) Table salt (NaCl) is 40% sodium by weight. If a box of salt weighs 18 ounces, how much sodium is in the box of salt?

4) A student’s tuition bill is \$17,651. Her financial aid pays 80%. How much will the student owe?

5) If 1 roll of tape costs \$0.69, how much do 3½ rolls costs? (Round to the nearest cent)

6) If 1 centimeter equals ⅜ inch, how many centimeters is a nail that measures 3 inches?

7) You work in a health care clinic where each employee must work 25% of 8 major holidays. How many holidays will you expect to work?

• 15

2)

• 7.2

• \$3530.20

• \$2.42

• 8 cm

• 2 holidays

• The Math Placement test is given in the Testing Center.

• There is a review book for the placement exam in the Annandale Library. (CG 3rd Floor)

• It’s called Chart Your Success on the Compass Exam.

• Brush-up on current skills, go through what you know.

• Don’t try to teach yourself anything that you do not know.

• Use the list of suggested websites to help you review.

• Neither the Math Center nor the Tutoring Center will help you study for the exam.