@skylar >the wall is 22-1/4" long
>your baseboard is 3/8" thick.
What the actual fresh hell?
>the answer is immediately obvious: it needs to be 22-5/8"
Having to do 1/4 -> 2/8 -> 2/8 + 3/8 -> 5/8 is several error prone steps and that's even with fractions selected to match up.

Now try to do 22-1/7in long + 3/8 in for me without a calculator (yes, I have seen 1/7in and 15/16in and worse).

It's far easier in metric - the wall is 50cm long and the baseboard is 10mm thick - it needs to be 51cm, or if the baseboard is actually 9mm thick that's 509mm, or if the baseboard is actually 8.5mm thick, that's 508.5mm.

Imagine gaslighting yourself into thinking the most backwards way to do things is "easy to do".