Directions: Answer these question pertaining to scientific notation, as defined in each situation. Check your answer when finished.

1.
Earth is approximately 93,000,000 miles from the sun. Express this distance in miles in scientific notation.
Choose:
 93 x 106 9.3 x 107 93 x 107 9.3 x 106

2.
Light travels at a speed of 1.86 x 105 miles per second. Express this speed in standard notation in miles per second.
Choose:
 0.000186 0.0000186 18,600 186,000

3.
The wavelength of an X-ray is 0.00000009 cm. Express this length in centimeters in scientific notation.
Choose:
 9.0 x 108 9.0 x 10-8 0.9 x 10-7 0.9 x 108

4.
The distance from the Earth to the Moon is approximately 239,000 miles. Using this value, express a round-trip to the Moon in miles in scientific notation.
Choose:
 4.78 x 1010 2.39 x 1010 2.39 x 105 4.78 x 105

5.
The number of megabytes of wireless data used by Americans in one typical year exceeds 1.4 x 1013 megabytes. Using this value, determine approximately the number of megabytes that are used in one day.
Choose:
 7.84 x 1013 7.84 x 1015 3.8356 x 1013 3.8356 x 1010

6.
The number of text messages sent every second by US consumers exceeds 70,000 messages. Using this value, approximate, in scientific notation, the number of messages sent in one hour.
Choose:
 4.2 x 106 2.52 x 108 4.2 x 10-6 1.512 x 1010

7.
It is estimated that wireless soil monitors could save up to 6 trillion gallons of water per year by reporting precise information needed to irrigate crops properly. Using this data, express the number of gallons of water saved in two years, in scientific notation.
Choose:
 1.2 x 1012 1.2 x 1018 1.2 x 1013 1.2 x 1024