noun, noun or participle which takes 'suru', transitive verb
counting backwards; calculating backwards; back-calculation
General term for working backwards from a result to find a cause, starting point, or required input. Often used in planning, scheduling, and problem-solving.
締め切りから逆算して、今日中に始めなければならない。
Working backwards from the deadline, I have to start today.
必要
I back-calculate the necessary budget.
noun
inverse operation
Mathematics term for the reverse of a given operation, such as subtraction being the inverse of addition.
足し算の逆算は引き算です。
The inverse operation of addition is subtraction.