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Addition is the mathematical operation that combines two or more numbers to produce their [[sum]].
It is helpful to see addition in terms of [[function]]s - addition adds one number (a) to another number (b) to make their sum (c).
Thus,
a + b = c.
Its reverse function, or [[inverse operation]], is [[subtraction]], which moves the other way:
c - b = a.
It is possible to add a negative number, but this is the same as subtracting that number:
a + (-b) = a - b.
==Methods for addition==
For simple addition, it is easy to add by counting steps. If we consider 6 + 4, then we can start at 6, then add 1 four times - 7, 8, 9, 10. Thus, 6 + 4 is 10.
For more complex addition, columnar addition can be carried out.
[[category:mathematics]]
[[category:mathematics]]