Scientific Notation

Express the following number in scientific notation:

0.0021

• .21 x 10³

• 2.1 x 10³

• 2.1 x 10^-3

• 21 x 10^-3

Express the following number in scientific notation:

10,005

• 1.0005 x 10^-4

• 1.0005 x 10⁴

• 10.005 x 10³

• .10005 x 10⁵

Express the following number in scientific notation:

0.490

• 4.90 x 10^-1

• 0.490 x 10⁰

• 49.0 x 10²

• 4.90 x 10¹

Express the following number in scientific notation:

445,000

• 44.5000 x 10⁴

• 4.45 x 10^-5

• 44.5 x 10^-4

• 4.45 x 10⁵

Express the following number in its expanded form:

2.24 x 10⁵

• 224,000

• 0.0000224

• 22,400

• 0.000224

Express the following number in its expanded form:

1.5 x 10^-9

• 1,500,000,000

• 150,000,000

• 15,000,000

• 0.0000000015

Express the following number in its expanded form:

6.55 x 10^-1

• 655

• 0.655

• 6.55

• 65.5

Express the following number in its expanded form:

9 x 10³

• 0.0009

• 0.009

• 9,000

• 900

Perform the following calculation.

Express your answer in scientific notation.

(7.4 x 10^-2) - (6.5 x 10^-4)

• 4.81 x 10⁷

• 7.335 x 10^-2

• 9.0 x 10^-1

Perform the following calculations.

Express your answer in scientific notation.

(5 x 10⁴)(2 x 10²)

• 10 x 10⁸

• 3.0 x 10⁸

• 1.0 x 10⁷