Dyscalculia means the inability to perform simple mathematical calculations. It is a disability that originates at birth, and therefore should not be confused with acalculia, which is the inability to perform simple mathematical calculations because of an injury to the brain. People with dyscalculia often cannot even tell which of two numbers is larger. Sometimes people are able to perform mathematical calculation but cannot apply to real life situations, i.e., they can only do mathematical problems, not story problems. Dyscalculia is sometimes accompanied by disabilities with other areas of mathematics, such as telling time, logic, or spatial relationships, but is not necessarily.