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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6.50 x 10^3 years
A 10-20 vdc power source is a low output power supply used for small devices like battery chargers, notebook computers, and appliances. They use AC power input to convert it into DC power.
you x it by 10 to the power of -6 as mm is already 10-3 so to get to nm which is 10 -9 you would have to x by 10-6
The expression, 0.261 is referred to as a decimal fraction. To convert it to an ordinary fraction multiply it by the relevant power of 10 to convert it to a number with NO portion AFTER the decimal point, put the relevant power of 10 as the denominator and see if the fraction can be simplified. 0.261 = 0.261 x 1000 / 1000 = 261/1000
The E is an abbreviation of Exponent and means ×10^ → 6.21E10 = 6.21 × 10^10 To convert such a number to normal format as multiplication is by a power of 10, move the decimal point the number of digits that is the power of the 10 (positive to the right, negative to the left) inserting zeros if the digits run out. → 6.21E10 = 6.21 × 10^10 = 62,100,000,000