User:Atcovi/Scientific Notation Rules

Adding & Subtracting

 * (2.5 x 106) + (5 x 105) = 3 x 106
 * Exponents the same
 * In this case, since the exponents aren't the same--you've got to change 105 (smaller exponent) to 106. In order to do this, you need to also move the decimal point of "5" to the left, making it .5 x 106. Doing the multiplication as shown, you will get 3000000 (3 x 106).
 * (20 x 103) - (1 x 104) = 1 x 104
 * Exponents the same
 * In this case, since the exponents aren't the same--you've got to change 103 (smaller exponent) to 104. In order to do this, you need to also move the decimal point of "20" to the left, making it 2.0 [2] x 104. Doing the multiplication as shown, you will get 10000 (1 x 104).

Multiplying & Dividing

 * (2.5 x 10-3)(3 x 10-9) = 7.5 x 10-12
 * Add exponents, multiply numbers.
 * (9.9 x 1018) ÷ (3.3 x 102) = 3 x 1016
 * Subtract exponents, divide numbers.