Percents

vocab

100

define 'part' in your own words...

A specific portion or segment of a whole.

200

define 'whole' in your own words...

The entire quantity or amount.

300

define 'principal' in your own words...

The original amount of money that is invested, borrowed, or loaned.

400

define 'percent change' in your own words...

Measures the accuracy between the measured value and the true value, expressed as a percentage of the true value.

500

define 'interest rate' in your own words...

A percent used to calculate interest on the principal

analyze percents

100

Find 30% of 26

30% = 7.8 

200

Find 0.9% of 4000

0.9% = 36

300

Set up a proportion for this problem. Do not solve.

Find 32% of 180 

32                x 

___    =     ____

100            180

400

Set up an equation for the problem below. Do not solve. 

Find 7% of 326. 

part = percent x whole

x = 0.07 x 326

500

What is 12% of 5,280

633.6

change/error

100

If the original quantity is 100 and the new quantity is 88, what is the percent decrease? 

12% decrease

200

If the original quantity is 20 and the new quantity is 25, is this a percent increase or percent decrease?

increase

300

If the original quantity is 35 and the new quantity is 19, is this a percent increase or percent decrease?

decrease

400

The number 360 is increased by 25%. The result is then decreased by 50%. What is the final number? 

225

500

Explain in your own words how finding percent error is similar to percent change

Finding percent error and percent change are similar because both compare the difference between two values to an original or reference value. 

error --> 

predicted - actual = difference

change --> 

new - old = difference

Markdown/up

100

Explain the difference between markup and percent markup in your own words. 

Markup refers to the increase in price. Percent markup refers to the percent to which it increased. 

200

Explain the difference between markup and markdown in your own words. 

markup --> Markup refers to the increase in price

markdown --> Markup refers to the decrease in price

300

A $20 pair of boots are on sale for 25% off. What is the markdown? 

markdown = $5

m = 0.25 x 20 

400

A computer store bought a program at a cost of $10 and sold it at a selling price of $13.Find the percent markup.

30% markup

500

Write the letter the expression is labeled with on your team board, if that expression can be used to find the price of a $400 telescope after a 32% markup.

A) 400 • 0.32

B) 400 • 3.2

C) 400 • 1.32

D) 400 + 400(0.32)

E) 400 • 400(1.32)

 

C) 400 • 1.32

D) 400 + 400(0.32)

Interest

100

In 1 year, Sarah earned $4. How much interest would she earn in 7 years?

4 x 7 = $28

200

An interest rate for a savings account at the bank is 3.2%. How would this percent be expressed as a decimal. 

divide by 100 --> 0.032

300

What does the word principal mean?

The initial amount of money invest or borrowed is called the principal

400

I = p x r x t

I = $200 x 0.06 x 6

I = $72

500

Jordan took out a loan to help pay for college. The loan charges 5% simple interest per year. After 4 years, Jordan will have paid $600 in interest. How much money did Jordan originally borrow?

I= p x r x t 

600 = p x 0.05 x 4

p = $3,000