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8th Grade Math Vocabulary

Week 21

Percentage

A number divided by 100.

It is the number of parts out of 100 of something.

Percentage

For example, a quarter (25 cents) is 25 percent of a dollar (100 cents).

A quarter = 25 cents

A dollar = 100 cents

Percentage

A quarter (25 cents) is 25 percent of a dollar (100 cents).

The fraction 25/100 is 25 percent, sometimes written as 25%

Discount

A decrease in the regular price.

Discount

A decrease in the regular price.

Discount

A decrease in the regular price.

Ex. Sale 20% Off

Regular Price is $50

Discount

20% of $50

.20 x $50

Discount

$50

X .20

___________

00

1000

___________________

1000

Starting from far right move decimal 2 spaces left.

$10.00

Discount

$50 original price

$10 Discount

____________________

New Price $40

Commission

Money earned based on a percent of sales.

Commission

For example, I am a salesman at a hardware store, and I earn 10% commission on the sales that I make.

Commission

If I sell $3200 of merchandise at the store today, how much will I earn in commission?

Commision

To figure out what 10% commission is on $3200 of sales multiply $3200 by .10

Commission

$3200

X .10

_________________

0

32000

_____________________

32000

Starting from far right move decimal 2 spaces left.

$320

Tip

Money given for a job well done.

Tip

Be sure to give your waiter a 20% tip if he does a good job.

Tip

Check please!

My restaurant check is

$76

Tip

If I give the waiter a 20% tip, how much tip does the waiter get?

Tip

$76

x.20

_____________

0

1520

_______________

1520

____________________

$15.20 Tip for the waiter

Tip + Check Amount = Total Owed

$76 .00 Check Amount

$15.20 Tip

______________

$91.20 Total Owed

Base

In a percent proportion, the whole quantity, or the number to which the part is being compared.

Base

4 out of 10 people wear glasses.

4:10

or

4/10

10 is the BASE

Percent Proportion

A proportion or an equation made up of two fractions to solve percent problems.

What is 20% of 10?

Percent Proportion

What is 20% of 10?

10

X .20

__________________

0

200

_________________________

200

Starting from far right move decimal 2 spaces left.

2.00

Percent Proportion

What is 20% of 10?

2/10 = 20/100 = 20%

2 is the part

10 is the base

20 is the percent

Interest

Money you can earn on money in a bank account or money you have to pay on a bank loan.

Interest

For example, if I can earn 2.5% interest per year on money deposited and I deposit $100,000 how much money in interest will I earn in 1 year?

Interest

$100,000

X .025 (2.5%)

_____________

500000

2000000

00000000

__________________

2500000

Starting from far right move decimal 3 spaces left.

$2,500.00 interest in 1 year earned

Principal

The starting amount to which Interest is added.

For example, the original amount that is borrowed in a loan is the principal of that loan.

Principal

For example, if one borrows $100,000, the principal amount is $100,000. Interest is calculated on the principal (and often over unpaid interest that accumulates).

Students can take a quiz on these words at www.RudolphAcademy.com