Excuse me, how does excel change uppercase numbers into lowercase numbers?

1858 uppercase words become 180 lowercase words.

1- Click the format, select the cell option, select Special in the number classification, select Chinese lowercase numbers as the type, and click OK!

2- This second scheme is the most simple and practical. Because yours are capital letters, which are special Chinese characters. So we have to use the substitution method. That is, start "and then manually replace it with 1. And so on. After ten substitutions, all the figures were corrected.