Each row takes the current left-to-right partial dividend, finds the next quotient digit, subtracts the matching product, and carries the remainder forward.

This follows the same schoolbook structure students write by hand rather than repeated subtraction of the whole dividend.

Every whole-number division result fits the form $ext{dividend}= ext{divisor}cdot ext{quotient}+ ext{remainder}$.

The remainder must always stay smaller than the divisor.