Scientific Notation and Measurement

There are approximately 3.1 x 10⁸ people in the United States. If each person has 4.1 x 10¹ coins, how many coins are there altogether?

• 271 x 10¹⁰

• 271 x 10⁹

• 271 x 10¹¹

• 271 x 10⁸

In Australia, the people use approximately 2,240,000,000 pounds of bread in a year. How can we write this number in scientific notation?

• 2.240 x 10^-9

• 224 x 10⁶

• 2.2 x 10⁶

• 2.240 x 10⁹

The average width of a piece of human hair is .0001m. What is this measurement in scientific notation?

• 1 x 10⁴

• 1 x 10^-4

• 10 x 10^-5

• 1 x 10^-3

Select all that are correctly written in scientific notation.

• 56.7 x 10³

• 3.4 x 10^-4

• 5 x 10^-99

• 10⁵

• 3.75 x 10

To multiply amounts in scientific notation, you can simply _______ the decimals and _______ the exponents.

• multiply...add

• add...add

• multiply...subtract

• multiply...multiply

To divide amounts in scientific notation, you can simply _______ the decimals and _______ the exponents.

• divide...subtract

• subtract...subtract

• divide...add

• divide...divide

When you move the decimal to the left in scientific notation, it __________ the exponent.

• increases

• decreases

Add.

(2 x 10³) + (5 x 10⁵)

• 7 x 10²

• 10 x 10¹⁵

• 5.02 x 10⁵

• 1.0 x 10²

Subtract

(3 x 10³) - (5 x 10²)

• 2 x 10¹

• 2.5 x 10³

• 2.5 x 10²

• -2 x 10¹

Multiply:
(3.4 x 10⁵)(1.2 x 10^-3)

• 4.08 x 10^-8

• 4.8 x 10²

• 4.08 x 10²

• 4.08 x 10^-15