1) Arithmetic exercise 
In arithmetic, long division is a standard division algorithm suitable for dividing multidigit numbers that is simple enough to perform by hand. It breaks down a division problem into a series of easier steps. As in all division problems, one number, called the dividend, is divided by another, called the divisor, producing a result called the quot...
[n] - the operation of division in which the sequence of steps are indicated in detail
noun the operation of division in which the sequence of steps are indicated in detail
division, usually by a number of two or more digits, in which each step of the process is written down.