Course 2, Lesson 2-3 Estimate. 1. 48% of 30 2. 8.5% of 268 3. 112% of 49 4. 83% of 79 5. Twenty-two percent of the seventh-grade class at Santa Ana Middle

Course 2, Lesson 2-3

Estimate.

1. 48% of 30

2. 8.5% of 268

3. 112% of 49

4. 83% of 79

5. Twenty-two percent of the seventh-grade class at Santa Ana

Middle School has blue eyes. If the seventh-grade class has

139 students, about how many have blue eyes?

6. Write an estimate of 128% of 179?


ANSWERS

1. 15

2. 28

3. 55

4. 64

5. 28

6. 225

HOW can percent help you understand situations involving money?

Ratios and Proportional Relationships



Course 2, Lesson 2-3 Common Core State Standards © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.

7.RP.3Use proportional relationships to solve multistep ratio and percent problems.

Mathematical Practices

1 Make sense of problems and persevere in solving them.

3 Construct viable arguments and critique the reasoning of others.

4 Model with mathematics.

To use the percent proportion to find:• the Percent• the Part, or• the Whole



Percent Proportion



Percent Proportion



Find the percent

Find the part

Find the whole

whol=part

e 100n

percentnumber

who e=

l 100n

percent numberpart =

100n

How did what you learned today help you answer the




How did what you learned today help you answer the




Sample answers:• You can use the percent proportion to solve situations

involving money.

The next lesson will be about solving problems

using the percent equation. Predict what the percent equation might look like since it is based on the

percent proportion.




Documents

Course 2, Lesson 2-3 Estimate. 1. 48% of 30 2. 8.5% of 268 3. 112% of 49 4. 83% of 79 5. Twenty-two percent of the seventh-grade class at Santa Ana Middle