Multiply Divide Scientific Notation Word Problems

As part of a community service project, a class planted 7x10⁵  trees in a year.  If there are 3.5x10³ students in the school, how many trees did each student plant?

• 2 x 10⁸

• 2 x 10²

• 3.5 x 10⁸

• 3.5 x 10²

Solve:
(6 x 10⁶) / (2 x 10³)

• 12 x 10³

• 3 x 10⁹

• 1.2 x 10⁴

• 3 x 10³

A microgram is equal to 1 x 10 ^-6 grams. How many times greater than a microgram is 1 x 10² grams? 

• 1 x 10^-8

• 1 x 10^-4

• 1 x 10⁴

• 1 x 10⁸

The pitch of a sound is determined by the number of vibrations produced per second.  The note “middle C” produces 2.62 x 10² vibrations per second.  If a pianist plays middle C for 5 x 10^-1 seconds, how many vibrations will occur?

• Addition

• Subtraction

• Multiply

• Divide

The US spends an average of 2x10⁴ dollars on each student per year. There are about 6.x10⁷ students in the US. About how much money total is spent on students per year?

• 1.2 x 10¹³

• 1.2 x 10¹²

• 8. x 10¹¹

• 4 x 10²⁸

A corporation earned a profit of $2.5 × 10⁴ for 1 × 10³ days in a row. What was the corporation’s total profit during this time period?

• 2.5 million

• 25 million

• 1.2 million

• 26,000

A TV show had 3.5 × 10⁶ viewers for their first episode and 8.5 × 10⁶ viewers for their second episode. How many viewers did they have overall?

• 1.2 x 10⁷

• 1.2 x 10^-7

• 1.2 x 10⁶

• 1.2 x 10^-6

The US spends an average of 1.02x10⁴ dollars on each student per year.  There are about 7.6x10⁷ students in the US.  About how much money total is spent on students per year?

• 7.752 x 10¹¹

• 7.752 x 10²⁸

• 8.62 x 10¹¹

• 8.62 x 10²⁸

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?

• 19 x 10^-7

• 19 x 10⁷

• 11.9 x 10⁶

• 19 x 10⁶

In 1985 Earth had 4.9 ×10⁹ people living on it and in 2005, earth had 6.4 ×10⁹ living on it. How many more people inhabited Earth in 2005 than in 1985?

• 13 x 10⁹

• 1.13 x 10¹⁰

• 1.5 x 10⁸

• 1.5 x 10⁹