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The sum.
In an addition sum, if the missing number is the first number, for example, x + 5 = 10, then to find x, perform the sum 10 - 5, producing the solution x = 5. In a subtraction sum, if the missing number is the second number, for example, 7 - y = 4, then to find y, perform the sum 7 - 4 = 3, production the solution y = 3.
In order to know which operation, you have to find the keywords. EX: how many more, difference, sum, total, etc.
An additive operation is an operation which produces the sum of two operands.
By adding.