Scientific Notation Review

Write 0.007 as a single digit times a power of ten.

• 7 x 10²

• 7 x 10³

• 7 x 10^-3

• 7 x 10^-2

Express 2.53 x 10^-3 in standard form.

• 0.00253

• 0.0253

• 0.253

• 2.53

Which number is the best ESTIMATE of 47,320,000?

• 4.7 x 10^-6

• 5 x 10⁷

• 5 x 10^-7

• 4.7 x 10⁶

The mass of Earth is about 5.97 x 10²⁴ kg and the mass of Mars is about 6.417 x 10²³ kg.

What is the difference in their masses?

• 53283 x 10²³

• 53.283 x 10²⁴

• 5.3283 x 10²³

• 5.3283 x 10²⁴

Which expression is equivalent to 2.2 x 10^-2 ÷ 4.4 x 10³ ?

• 0.5 x 10^-5

• 5 x 10⁶

• 0.5 x 10⁵

• 5 x 10^-6

Solve. Express the answer in scientific notation.

(3.1 x 10⁴) + (1.7 x 10²)

• 3.27 x 10⁴

• 3.117 x 10⁴

• 4.8 x 10⁶

• 4.8 x 10⁴

Write 0.09 as a single digit times a power of ten.

• 9 x 10^-2

• 9 x 10²

• 0.9 x 10^-2

• 0.9 x 10²

Express 3.072 x 10^-3 in standard form.

• 307.2

• 0.3072

• 0.003072

• 0.03072

Which number is the best ESTIMATE of 68,520?

Answer in scientific notation.

• 68,000

• 70,000

• 7 x 10⁴

• 6.8 x 10³

Which expression is equivalent to (4.2 x 10^-2 ) ÷ (5.6 x 10³ )?

• 75 x 10^-6

• 7.5 x 10^-6

• 7.5 x 10^-5

• 0.75 x 10^-5