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NO. 2

Study it for a moment.

10,000 = 104

1,000 = 103

100 = 102

10 = 101

1 = 100

Notice that 100 = 1

.1 = 10-1

.01 = 10-2

.001 = 10-3

.0001= 10-4

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No. 3

Any number can be converted into 2 numbers: A number times a power of 10. The number

times a power of 10 will have the same digit sequence as the original number. The power of

10 and its sign will be determined by the number of places and the direction the decimal point

in the original number is moved.

Examples: 7,900 = 7.9 X 103

because 103

= 1,000

.01 =1 X 10-2

"

10-2

= .01

75 = 7.5 X 101

"

10-1

= 10

.075 = 7.5 X 10-2

"

10-2

= .01

.075 = 75 X 10-3

"

10-3

= .001

.075 = 750 X 10-4

"

10-4

= .0001