scientific notation

If a number written in scientific notation has a positive power of 10, it represents a number that is

• really big

• really small

If a number written in scientific notation has a negative power of 10, it represents a number that is

• really big

• really small

The lead number of a number written scientific notation must be

• less than one 1

• greater than or equal to 1 and less than 10

• greater than 10

Write in standard form: $4\times10^6$   

• 4,000

• 40,000

• 400,000

• 4,000,000

Write in standard form: $3.6\times10^5$   

• 360,000

• 36,000

• 3,600

• 360

Write in standard form: $2.4\times10^{-3}$   

• 0.024

• 0.0024

• 0.00024

• 0.000024

Write in standard form: $7\times10^{-4}$   

• 0.07

• 0.007

• 0.0007

• 0.00007

Write in scientific notation: 2,000,000,000

• $2\times10^{10}$

• $2\times10^9$

• $2\times10^{-10}$

• $2\times10^{-9}$

Write in scientific notation: 0.0055

• $5.5\times10^{-3}$

• $5.5\times10^{-2}$

• $5.5\times10^3$

• $5.5\times10^2$

The closest distance between Earth and Mars is 33,900,000 miles. Express this distance in scientific notation.

• $3.39\times10^7$

• $3.39\times10^5$

• $3.39\times10^6$

• $3.39\times10^8$