Scientific Notation

Choose the number that is written in scientific notation.

• 7.8 x 10³

• 0.78 x 10^-2

• 78.0 x 10^-4

• 780 x 10⁵

Which of these numbers is the smallest?

• 3.5 x10⁷

• 3 x10⁷

• 5 x10⁷

• 5.5 x10⁷

To compare two numbers that are in scientific notation, first compare the ________ . If they are the same, then compare the ___________.

• base; exponents

• first number; next number

• exponents; bases

• exponents; coefficients

Which of these numbers is the greatest?

• 9 x 10⁹

• 8.1 x10⁸

• 9.02 x10⁹

• 6.35 x10⁷

Place the following numbers in order from least to greatest:

7.8 x 10⁶, 5.1 x 10⁴, 1.25 x 10⁵, 4.09 x 10⁴

• 4.09 x 10⁴,

  1.25 x 10⁵,

  5.1 x 10⁴,

  7.8 x 10⁶

• 4.09 x 10⁴,

  5.1 x 10⁴,

  1.25 x 10⁵,

  7.8 x 10⁶,

• 1.25 x 10⁵,

  4.09 x 10⁴,

  5.1 x 10⁴,

  7.8 x 10⁶,

The diameter of the planet Mercury is

4.87 x 10³ km. The diameter of the planet Venus is 1.21x10⁴ km. The diameter of the planet Mars is 1.28 x 10³ km.

Which planet has the smallest diameter?

• Mercury

• Mars

• Venus

7.82 x 10^-6 is an example of scientific notation. The exponent of -6 tells you your number will be very ________.

• Big

• Small

Change from standard form to scientific notation: 12,000,000

• 12.0  x  10⁷

• 0.12  x  10⁷

• 1.2  x  10⁶

• 1.2  x  10⁷

Change from standard form to scientific notation:  450,000

• 4.5  x  10⁵

• 45  x  10⁵

• 4.5  x  10⁴

• 4.5  x  10⁶

Change from standard form to scientific notation:

0.000398

• 39.8  x  10^-5

• 3.98  x  10^-5

• 3.98  x  10^-4

• 39.8  x  10^-6