Enhanced Unit 4A Review

An expression is shown.

5³ x 5^-2

What is the value of the expression?

• 5
• 125
• 25
• -5

Sort each equation as TRUE or FALSE.

Groups:

(a) TRUE

,

(b) FALSE

The population of Australia is approximately 2.5 × 10⁷. The population of United States is approximately 330,000,000. Which of the following statements accurately compares the populations of Australia and United States?

• The population of United States is larger than the population of Australia.

• The population of Australia is larger than the population of United States.

• The population of Australia and United States are the same.

• The population of Australia is 10 times larger than the population of United States.

Justin Bieber, has approximately 112,000,000 fans on Facebook. Selena Gomez, a singer, has approximately 1.18 × 10⁸ fans on Facebook. Which celebrity has the greater number of fans?

• Both

• Selena Gomez

• Justin Bieber

• Neither

Two numbers, n and m, are shown as they appear in scientific notation on a scientific calculator. Which of the following expressions represents the relationship between the numbers written in scientific notation?

• m is less than n

• m is greater than n

• m is equal to n

Express this product in scientific notation: (12 x 10⁸)(13 x 10³)

• 120 x 10¹¹

• 145 x 10¹¹

• 169 x 10¹¹

• 1.56 x 10¹³

Mathematical Equivalence

ON

What is the equivalent expression for (3.5 × 10³) + (2.0 × 10⁴) in scientific notation?

• 2.35 × 10⁴

• 5.5 × 10⁴

• 2.5 × 10⁴

• 1.5 × 10⁴

Express your answer in scientific notation: ​ 7.2 × 10⁸ − 2.3 × 10⁷

• 7.2 x 10⁸

• 6.97 x 10⁸

• 4.9 x 10⁸

• 5.2 x 10⁸