It is called the minuend The number you subtract from it is called the subtrahend
It is called the difference.
The resulting number is called the difference.
Minuend, subtrahend and the difference.
Like any other number.
You subtract some other number, or you divide by some other number, etc.
Subtract your lunch money from your total.You will need to subtract one number from the other.
'Zero' and any other number.
You will get zero if you subtract a number from itself.