In addition to checking your spelling you must make sure your grammar is correct. In addition to the two bedrooms they have added two bathrooms. In addition to three helpings of the main course he managed two of the puddings.
ADDITION.
the total of two or more quantities as if by the mathematical process of addition.
The result is called the sum of the two numbers. The operation of addition is commutative. This means that the addition of two numbers will give the same sum regardless of the order in which the numbers are added.
it goes like this addition is when you add two numbers to get the sum
sum and addends
it is edition
To add two numbers together
Actually, "in addition" is a coordinating conjunction that connects two ideas of equal importance. It is used to add or join two independent clauses.
The addition sign is formed by two intersecting lines, as is the cross. The two lines are perpendicular to each other.
Integer addition is simple adding two non-decimal numbers together. For example 2+2 is integer addition.
Addition polymerisation