Estimating quantities and units using scientific notation

Express the following in scientific notation:
.000457

• 457 x 10^6
• 457 x 10^-6
• 4.57 x10^4
• 4.57 x 10^-4

8.3 x 10³

• 83
• 8,300
• 0.0083
• 830

Convert 2.5 x 10^8 to standard form.

• 250,000,000

• 25,000,000

• 2,500,000

• 2,500,000,000

How many calories does the average American consume on Thanksgiving?

• 1,000

• 2,500

• 4,500

• 6,000+

Write 9.31 x 10^-5               in standard notation.

• 93,100,000
• 931,000
• 0.00000931
• 0.0000931

Arrange the numbers from least to greatest:
216,000,000 ; 2.2 x 10³ ; 3.1 x 10⁷ ; 310,000

• 2.2 x 10³ ; 310,000; 3.1 x 10⁷ ; 216,000,000
• 310,000 ; 2.2 x 10³ ; 3.1 x 10⁷; 216,000,000
• 3.1 x 10⁷ ; 310,000; 2.2 x 10³; 216,000,000
• 2.2 x 10³ ; 3.1 x 10⁷ ; 310,000 ; 216,000,000

Write the following number in scientific notation:

.0004

• $4\cdot\ 10^4$

• $40\cdot10^{10}$

• $40\cdot10^2$

• $4\cdot10^{-4}$

Which is the smallest?
1.3 x 10²⁰
2.9 x 10²¹
9.5 x 10³²
8.4 x 10¹⁹

• 1.3 x 10²⁰
• 2.9 x 10²¹
• 9.5 x 10³²
• 8.4 x 10¹⁹

3.9 x 10⁸

• 390000000.

• 39000