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6-8 Grade 8 Unit 7 Lesson 12

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Unit 7, Lesson 12

Applications of Arithmetic with Powers of 10

Grade 8

Practice

Problem 1
Student Task Statement
Which is larger: the number of meters across the Milky Way, or the number of cells in all humans? Explain or show your reasoning.

Some useful information:

The Milky Way is about 100,000 light years across.

There are about 37 trillion cells in a human body.

One light year is about meters.

The world population is about 8 billion.

Lesson 12 Resources

Student Materials Student Materials in Spanish

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Problem 2

Student Task Statement

What information would you need to know in order to solve the following problem?

Suppose that someone leaves all the lights on at your school. Before leaving for the day, the principal goes around and turns off all the lights. How long does this take?

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Problem 3

Student Task Statement

Lin’s mother has a car that she uses for work, shopping, and trips. About how many times does one tire on her car revolve in a year? Explain or show your reasoning.

Some useful information:

The diameter of her tire is 27 inches.
She drives about 10,000 miles in one year.
There are 5,280 feet in one mile.
There are 12 inches in one foot.

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Problem 4

ForLesson 5: Describing Trends in Scatter Plots

Student Task Statement

Ecologists measure the body length and wingspan of 127 butterfly specimens caught in a single field.

Draw a line that you think is a good fit for the data.
Write an equation for the line.
What does the slope of the line tell you about the wingspans and lengths of these butterflies?

Scatterplot, wingspan in millimeters, body length in millimeters. Please request assistance.

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Problem 5

ForLesson 5: Solving Any Linear Equation

Student Task Statement

Diego was solving an equation, but when he checked his answer, he saw his solution was incorrect. He knows he made an error, but he can’t find it. Where is Diego’s error and what is the solution to the equation?

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Problem 6

ForLesson 7: Similar Polygons

Student Task Statement

The two triangles are similar. Find .

Two triangles. The first has acute angles marked 46 degrees and x degrees. The second has an obtuse marked 106 degrees.

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