(1)The sum of two or more numbers is known as addition.
(i) 5 +7 = 12
(ii) 11 + 19 = 30
(2) The numbers which we add are called addend.
In the above example 5 and 7 are addends.
(3) The result of sum is called total of addends.
In the above example 12 is total or sum.
Addition can be done by two methods.
(i) Simple method
(ii) Carry over method