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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