1. The equatorial radius of Mars is 3,394 km. Which of the following would be a
reasonable estimate for the equatorial radius of Mars?
A. 3 × 10-4 km
B. 3 × 10-3 km
C. 3 × 104 km
D. 3 × 103 km
2. According to the Bohr model, the radius of a hydrogen atom is approximately5.29 ×
10-11 meters.
What is this measurement written in standard form?
A. 0.00000000529 meters
B. 0.00000000000529 meters
C. 0.0000000000529 meters
D. 0.000000000529 meters
3. The speed of light is 3 × 108 meters per second. What is this speed in standard form?
A. 300,000,000 meters per second
B. 300,000 meters per second
C. 3,000,000,000 meters per second
D. 30,000,000 meters per second
4. Which of the following would be a reasonable estimate for the height of a skyscraper?
A. 1 × 10-8 feet
B. 1 × 103 feet
C. 1 × 10-3 feet
D. 1 × 108 feet
5. Which shows the expression below simplified?
0.27 + (1.7 × 10-2)
A. 1.97 × 10-3
B. 1.97 × 10-2
C. 2.87 × 10-2
D. 2.87 × 10-1
6. Directions: Select all the correct answers.
Charlie determined that the distance from her grandmother's house to her house is more
than 20,000 feet but less than 26,000 feet. Which of the following could be a reasonable
estimate for the distance between the houses?
7. Which shows the expression below in simplified form?
(8.7 × 10-3) - (2 × 10-6)
A. 8.698 × 10-3
B. 8.68 × 10-4
C. 8.68 × 10-3
D. 8.698 × 10-4
8. The length of an object is measured as 36.9 centimeters. What is this measurement
in scientific notation?
A. 369 × 101 centimeters
B. 3,690 × 102 centimeters
C. 3.69 × 101 centimeters
D. 0.369 × 102 centimeters
9. Which shows the expression below simplified?
0.0000064 - (2.3 × 10-8)
A. 6.377 × 10-8
B. 2.2999936 × 10-8
C. 6.377 × 10-6
D. 4.1 × 10-6
10. The international border between the United States and Mexico is approximately1.951
× 103 miles in length. What is this distance in standard form?
A. 195,100 miles
B. 1,951 miles
C. 19,510 miles
D. 195.1 miles
11. Which shows the expression below in simplified form?
(3.8 × 1018) + (3.3 × 1016)
A. 7.1 × 1018
B. 3.833 × 1018
C. 3.8033 × 1016
D. 4.13 × 1016
12. Visible blue light has a wavelength of about 0.0000475 centimeters.
What is this measurement written in scientific notation?
A. 4.75 × 10-4 centimeters
B. 4.75 × 105 centimeters
C. 4.75 × 10-5 centimeters
D. 4.75 × 104 centimeters
13. The radius of the Earth is approximately 6,370 kilometers. What is the distance in
scientific notation?
A. 637.0 × 101 kilometers
B. 637.0 × 102 kilometers
C. 63.70 × 102 kilometers
D. 6.370 × 103 kilometers
14. A day is equivalent to 8.64 × 104 seconds. What is this time in standard form?
A. 864 seconds
B. 8,640 seconds
C. 86,400 seconds
D. 864,000 seconds