Numbers often appear in dreams as the age of a person, amounts of money, important dates, certain number of persons, floors of a hotel or time. They can symbolize any kind of interrelationship. Their meanings are often quite elusive.
First, consider specific references in your life or family to the number in the dream, such as births, deaths, anniversaries, numbers of siblings or children, a specific age. What financial significance might the number have? Does it enhance your understanding of the number to turn a whole number into a fraction, or to turn a fraction into a whole number, add all numbers in a dream to arrive at a total.
Second, consider any cultural meanings possibly sexual lingo that number has. Number can refer to putting things in order, especially their proper order; organizing or arranging. Are you experiencing some chaos or instability in your inner or outer life?