Estimate Quantities in Scientific Notation

A researcher measured approximately 0.005123 grams of bacteria in a sample. How is this number expressed in scientific notation?

• 5.123 × 10³ grams

• 5123 × 10^–6 grams

• 0.5123 × 10^–2 grams

• 5.123 × 10^–3 grams

Estimate the number as a single digit a power of ten

• 4 x 10^-6

• 3 x 10^-6

• 9 x 10^-9

• 4 x 10^-5

The thickness of a penny is about 6.1 x 10^-2 inches. Which of the following is equivalent to this measure?

• 0.0061 inches 

• 0.061 inches

• 0.61 inches

• 610 inches

The population of Kansas is 2,853,118 people. Which of the following is an estimation in scientific notation for the population?

• 2 imes10^{-6} people

• 3 imes10^6 people

• 2,800,000 people

• 3,000,000 people

A person weighing 150 pounds will have, on average, 0.000021 pounds of gold in his body. How is this amount of gold expressed in scientific notation?

Express the following number in usual form:
3.5 x 10^-5

• 0.000035

• 0.00035

• 0.0000035

• 0.0035

Convert to Scientific Notation: .0000000004

Write 9.8 x 10^-5 in standard form

• 0.00098

• 0.000098

• .098

• 98,000

Write 0.0000190 seconds in scientific notation

• 1.90 x10^-5 seconds

• 0.190 x 10^-5 seconds

• 19.0 x 10^-6 seconds

• 190 x 10^-7 seconds

Express the following quantities in scientific notation:  5800 m

• 5.8 x 10³ m

• 58.00 x 10³ m

• 5800 x 10¹ m

• 5.8 x 10⁴ m