# Unit Test, Part 2: Number Properties

Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit.

Total score: ____ of 15 points

(Score for Question 1: ___ of 4 points)

1. Refer to Expression 1 and Expression 2.

Expression 1

Expression 2

• What is the value of Expression 1?
• Insert parentheses in Expression 2 so that it has a value of 19. Then show why your expression has a value of 19.

(Score for Question 2: ___ of 3 points)

• The average distance from the sun to the planet Mercury is about 58,000,000 km. The diameter of a human hair is about 0.0025 cm.
• What is the distance from the sun to Mercury written in scientific notation?
• What is the diameter of a human hair written in scientific notation?
• In comparing the measurements in Parts (a) and (b), what else must be done before a comparison is made?

(Score for Question 3: ___ of 8 points)

• The population of Columbus, Ohio, in 2014 was about 823,000. The population of the United States was about 319 million in 2014.
• Write each population in scientific notation.
• About how many times larger was the population of the United States than the population of Columbus, Ohio? Show your work.