Scientific Notation
giving :
7.42 x 105 
The decimal point must be moved to the left. 
7 4 2, 0 0  0
(3).  
Alternately, begin with:
7.42 x 10
The number of places the decimal point must be moved so that the notation is in the correct form:
(2).
Value of the exponent?
exponent of 10 is a  positive whole nb.
(1).
a number greater than 1:
7 4  2, 0 0 0
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For each place the decimal point is moved to the left add 1 to the original exponent of 10
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5
x 100
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+
1
2
3
4
5