It could be either 'sum' or 'add'.
Not having to spell the word "operation"!
Maths
maths
maths
"o11" is a shorthand notation for the word "operation." It is commonly used in engineering and mathematical contexts to refer to a specific operation. The "o" stands for the first letter of the word "operation," and the "11" represents the number of letters between the first and last letters in the word.
Calculation means to do an operation such as add, subtract, multiply, divide, square or aquare root, etc. resulting in a numerical answer.
Maths (mathematics) is matamaitic.
maths/mathematics = mathématiques
It is usually a single character that is used to represent a mathematical object, operation, unit. Examples: P is a point. Square root is represented by "√" A degree is represented by "◦" But it could be multiple characters: ABC is a triangle.
Usually another word for some frequently used mathematical formula.
seven (If numbers subject, corresponds to the subject dealing with the numbers, then it is Maths)
Okaniwa and Operation Overlord