why do we have capital/lowercase letters but not capital/lowercase numbers?

Question

why do we have capital/lowercase letters but not capital/lowercase numbers?

In: 3

Answer 1

We do!

Here are capital numbers: I, II, III, IV, V.

Here are lowercase numbers: i, ii, iii, iv, v.

With Roman numerals/letters lowercase was originally used for everything. The uppercase font was created for use when carving stone monuments and stone buildings as lowercase is pretty much impossible to carve in stone.

Since no one has to carve arabic numerals on stone, there is no need for a different style of “lowercase” font. When we want lowercase we just use a different size version (subscript/superscript).