Applying operations on numbers expressed using scientific notation to solve mathematical and real-world problems

The Diplodocus dinosaur is believed to have become extinct approximately 1.38x10⁸ years ago.  The Oviraptor is believed to have become extinct approximately 7x10⁷ years ago.  How many years were there between the extinction of these two dinosaur types?

• 6.8 x 10⁸

• 6.8 x 10⁹

• 68 x 10⁸

• 6.8 x 10⁷

Compare, using <, >, or =

6.5 X 10⁸ _____ -7.4 X 10⁹

• <

• >

• =

 $\left(1.2\times10^{-4}\right)\left(3\times10^6\right)$  

•  $1.5\times10^3$  

•  $3.6\times10^2$  

•  $36\times10^2$  

•  $3.6\times10^{10}$  

In 2012, New York City (NYC) and Los Angeles (LA) has the highest populations of any cities in the United States. NYC’s population was about 8.1 × 10⁶ and LA’s population was about 3.8 × 10⁶. What is the population of these two cities combined?

• 1.19 x 10^-7

• 1.19 x 10⁷

• 11.9 x 10⁶

• 1.19 x 10⁶

4x10⁵ / 2x10⁴

• 80,000

• 9x10⁵

• 7x10⁵

• 2x10¹

Solve : (2 × 10¹²) × (1.5 × 10⁴)

• (9 × 108^.6)

• (3 × 1.0¹⁶)

• (3 × 10¹⁶)

• (3.5 × 10¹⁶)

The mass of he sun is 1.989 x 10³⁰ kilograms. The mass of the earth is 5.98 x 10²⁴ kilograms. How many times greater is the sun than the earth?

• 3.326 x 10⁵

• 3.326 x 10⁶

• 1.99 x 10³⁰

• 1.99 x 10⁶

How many times larger is 5 x 10⁷ than 5 x 10²?

• 1 x 10⁶

• 1 x 10⁴

• 1 x 10⁵

• 1 x 10⁹