Fractions/Decimals/Percents

Money• The most common application of math is money and personal

finance.• If you’ve ever balanced a checkbook, compared loans to buy a

car, or set up a retirement account, then you have had to call on your skills in decimals/fractions/percents to help you.

American Money• In the US, our money is based on dollars and cents. • One cent is represented as $.01, with a 1 in the hundredths

place, because it is 1/100th of a dollar.

• Notice “cents” is from the Latin centum meaning a hundred.

Sidenote: Korean Money• 1000 won= 1 US dollar

Compound Interest

Percents• Percents are also common in financial problems.• The value of 6.2% is equal to .062 or • Percents are used in sale prices, interest rates, commissions,

tips, and taxes.

I=prt interest=principle x rate x time• P. 60

Math in the WorkplaceFractions

Photographers and math

Photographers and math

Pharmacists and math

Pharmacists and math• Pharmacists use math to calculate dosages.

How do you think you’ll use math in your career field?

Fractions•

• A pharmacists is compounding a batch of medication that requires 218 ¼ g of a drug that costs $79.75 per kilogram and 124 ½ g of a drug that cost $38.50 per kilogram. How much is the cost of this batch?

• A pharmacists is compounding a batch of medication that requires 218 ¼ g of a drug that costs $79.75 per kilogram and 124 ½ g of a drug that cost $38.50 per kilogram. How much is the cost of this batch?

• Since the numbers are in both decimals and fractions, convert the decimals to fractions so you are working within the same format.

Drug Weight PriceDrug A 218 ¼ gram 79.75 79 ¾ per kgDrug B 124 ½ gram 38.50 38 ½ per kg