Select Appropriate Unit of Measure Using Scientific Notation

Which is most appropriate for the following value:
2.5 x 10^-4 meters

• 250 micrometers

• 25 micrometers

• 2.5 micrometers

• 0.25 millimeters

Which prefix
.000045

• micro

• nano

• Mega

• Giga

The diameter of a speck of dust is about 0.00002 inches. Which of these is an appropriate estimate for the diameter of the speck of dust?

• 2 × 10^–5 in.

• 2 × 10^–4 in.

• 2 × 10⁵ in.

• 340000

• 340

• 3400

• 34000

• A

• B

• C

• D

• 
• 
• 
• 

• 0.012

• 0.12

• 1.2

• 12

What can (2.5 x 10^8) be estimated as for easier comparison in scientific notation?

• (2 x 10^8)

• (3 x 10^8)

• (2.5 x 10^7)

• (3 x 10^9)

Which of the following units correctly completes the sentence? A human hair grows at a rate of 1.5 x 10^-1 _____________ per year.

• decameters

• kilometers

• miles

• meters

Which of the following would be a reasonable estimate for the weight of a pencil?

• 1x10^-20 lb

• 1x10² lb

• 1x10²⁰ lb

• 1x10^-2 lb