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6-8 Accelerated 6 Unit 6 Lesson 5

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K-5 Math •6-8 Math 9-12 Math

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•Accelerated 6 Accelerated 7

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Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 •Unit 6 Unit 7 Unit 8 Unit 9

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Lesson 1 Lesson 2 Lesson 3 Lesson 4 •Lesson 5 Lesson 6 Lesson 7 Lesson 8 Lesson 9 Lesson 10 Lesson 11 Lesson 12 Lesson 13

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Accelerated 6
Accelerated 7

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Unit 3
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Unit 6
Unit 7
Unit 8
Unit 9

Lesson 1
Lesson 2
Lesson 3
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Lesson 6
Lesson 7
Lesson 8
Lesson 9
Lesson 10
Lesson 11
Lesson 12
Lesson 13

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IM K-5 Math
IM 6-8 Math
IM 9-12 Math

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Unit 6, Lesson 5

One Hundred Percent

Accelerated 6

Practice

Problem 1

A city held a tree-planting event and increased the number of trees in their downtown area by 25%.

Before the event, they had 48 trees. How many trees do they have now?
Scientists have found that trees can make an area \(9^\circ\text{F}\) cooler. What percentage is this decrease if the peak summer temperature is usually \(90^\circ\text{F}\)?

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Problem 2

Lesson 5 Resources

Student Materials

A company has decreased the amount of plastic packaging on their product by 25%. If the packaging now weighs 48 grams, what did it weigh before the change?

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Problem 3

Noah thinks the answers to these two questions will be the same. Do you agree with him? Explain your reasoning.

This year, a herd of bison had a 10% increase in population. If there were 550 bison in the herd last year, how many are in the herd this year?
This year, another herd of bison had a 10% decrease in population. If there are 550 bison in the herd this year, how many bison were there last year?

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Problem 4

ForLesson 3: Say It with Decimals

Elena walked 12 miles. Then she walked 0.25 that distance. How far did she walk all together? Select all that apply.

\(12+0.25 \boldcdot 12\)
\(12\left(1+0.25\right)\)
\(12 \boldcdot 1.25\)
\(12 \boldcdot 0.25\)
\(12 + 0.25\)

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Problem 5

ForLesson 15: Area of a Circle

A circle’s circumference is 600 m. What is a good approximation of the circle’s area?

300 m²
3,000 m²
30,000 m²
300,000 m²

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Problem 6

ForLesson 3: Writing Equations to Represent Relationships

The equation \(d = 3t\) represents the relationship between the distance (\(d\)) in inches that a snail is from a certain rock and the time (\(t\)) in minutes.

What does the number 3 represent?
How many minutes does it take the snail to get 9 inches from the rock?
How far will the snail be from the rock after 9 minutes?

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