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The easiest way I know is to always remember that number line. Negative numbers are always to the left and positive numbers are always to the right of "O" (zero).
Numbers are always represented by its first point or position. For example lets look at the number 268000000. The first position is the number "2" and its appears (because theres no deicmal point or minus sign) that this is a positive number. So we start at the 2 and count the number of numbers after the 2 which is 8. So to write this number as an exponent we would say 268000000 is the same as saying 2.68x10 to the 8th power.
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