Addition is a mathematical operation in which quantities are combined. Addition is indicated by a + sign. An example of an addition problem would be this: If Jimmy has three apples and his mother then gives him seven, how many would he have. As an addition problem it would appear as: 3+7=? The three is then added to the seven and 10 is the solution to the problem.
Conservatives can as a rule solve a simple addition problem like the one above. When there are more difficult problems like seeing the senselessness in Young Earth Creationism this can be beyond them.