Rollup merge of #139889 - spencer3035:clean-ui-tests-3-of-n, r=jieyouxu

Clean UI tests 3 of n

Cleaned up 2 tests in `tests/ui/numbers-arithemetic` to be more useful. One for each commit. I can squash these into one commit when approved.

Related Issues:
#73494
#133895

r? jieyouxu

Author: matthiaskrgr