Write the following in scientific notation using powers of 10:

12). 7,000,000 =

_____________
13). 7,600,000,000,000,000,000,000 =

______________
14). 9,000,000 =

_____________
15). 3,500,000 =

______________
Write the following as decimal numbers:

16). 4 x 108 =

_____________
17). 3.14159 x 102 =

______________


[Extra Credit]:
Scientific notation is used in science to describe really big and really small numbers. Here are some scientific facts. Write the numbers as regular numbers (with zeroes ). Write small.

18). The mass of the earth is approximately 6 x 1024 kilograms. (really heavy!) Write this as a decimal.

6 x 1024= ___________________________