What is an Addition? An addition is one of the four basic operations in arithmetic. The other operations are subtraction, multiplication, and division.
Addition is a way of finding the sum or total by adding or putting together two or more numbers.
For example, 400 + 600 + 20 + 5 = 1025 is an addition. We found the sum or 1025 by adding 400, 600, 20, and 5.