Division often produce transcendental numbers, which truncated will show up as slight errors. If implemented as rational numbers that problem can be postponed, and then it will sometimes go away.
Only division of arbitrary real numbers will turn into a rational number, but further operation on those will stay as rational numbers.
A common example is 1/3 + 2/3 which is 0.99999… to some precision when done as real numbers, while rational numbers would give 3/3 which is 1.
Division often produce transcendental numbers, which truncated will show up as slight errors. If implemented as rational numbers that problem can be postponed, and then it will sometimes go away.
Only division of arbitrary real numbers will turn into a rational number, but further operation on those will stay as rational numbers.
A common example is 1/3 + 2/3 which is 0.99999… to some precision when done as real numbers, while rational numbers would give 3/3 which is 1.