Exponential notation is a method in mathematics that allows the representation of numbers in shorter form and aids in mathematical calculations. For example, 1,000,000 can be written as 1 x 106. Avogadro’s number, which is the number of molecules in 18 grams of water, is 602,000,000,000,000,000,000,000 or 6.02 x 1023. When multiplying large numbers together using exponential notation, the exponents are added. For example, 1,000 x 1,000 = 1,000,000. Or (1 x 103) x (1x 103) = 1 x 106.