Percents Review TEK 7.4D

GOALS: Understand part to whole relationship, understand y = kx, understand proportions

​

​Solving Problems with Percents

Dropdown

There are 900 students in an elementary school. On Friday, 36 students were absent. What percent of students were absent on Friday?

The ​

Select answer

is the total number of students in the elementary school.

The ​

Select answer

is the number of students that were absent on Friday.

The ​

Select answer

is unknown

Drag and Drop

The part-to-whole ratio in the problem is ​

Placeholder

absent student to ​

Placeholder

​ total students.

Drag these tiles and drop them in the correct blank above

36

900

864

Drag and Drop

Since the percent is unknown, x% is ​

Placeholder

. Therefore, the proportion is ​

Placeholder

= ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

Math Response

Solve the proportion:

$$\frac{36}{900}=\frac{x}{100}$$

Type answer here

Correct Answer: 4

Deg^°

Rad

Math Response

In a recent survey, 230 people, or 40% of the people surveyed, said that hamburgers were their favorite fast food to eat. How many people were surveyed

Type answer here

Correct Answer: 575

Deg^°

Rad

Percent Change

Example

At the local farmer's market, strawberries are normally $5, but this week they are on sale for $4. What is the percent decrease in price?

Step 2:

Determine the difference between the prices.

5 - 4 = 1

The difference is $1

​Step 1:

Steps to Solve Percent Change

Steps to Solve Percent Change

Find an equivalent ratio out of 100.

Step 3:

Math Response

An organization sent out 196 invitations

to a fundraiser. Of those, invited 280

attended. What percent of the people

invited attended the fundraiser?

Type answer here

Correct Answer: 70

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Rad

Math Response

A baby elephant was born last month at

the city zoo. When the baby elephant was

born he weighed 260 pounds. At the end

of the first month the baby weighed 338

pounds. What is the percent of increase in

the baby’s weight?

Type answer here

Correct Answer: 30

Deg^°

Rad

Math Response

Jose was playing a basketball shooting

game in the arcade. He made 15 shots and

missed 25 shots. What is the percentage of

shots Jose made in the basketball game?

Type answer here

Correct Answer: 60

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Rad

Multiple Choice

At a local grocery store, hamburger meat

is normally $3.50 per pound, but this

week hamburger meat is on sale for $2.10

per pound. What is the percent decrease

in the price?

• 14%

• 34%

• 60%

• 40%

Multiple Choice

A football team won 16 games last year.

This year the team won 20 games. What

is the percent increase in the number of

games the team won from last year to this

year?

• 20%

• 25%

• 80%

• 125%

Multiple Choice

Ms. Zepeda said that 30% of her students

made a B on the test last week. If 33

students made a B on the test, how many

total students does Ms. Zepeda have?

• 30

• 63

• 110

• 99

Math Response

A local car dealer has 250 cars on the lot.

30% of the cars are SUVs. How many of

the cars are NOT SUVs?

Type answer here

Correct Answer: 175

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Rad