What is 55 + 45?

55 + 45 is a simple arithmetic operation resulting in the sum of 100. It involves adding the numbers 55 and 45 together. This operation can be performed mentally or with the aid of a calculator. It is often used in everyday life situations such as calculating a total bill or adding up scores in a game. The sum of 100 is also an important number in mathematics, as it is the base for the decimal numbering system used worldwide in a variety of applications.