I’m early in my time learning kanji, and I’m starting to get exposed to on’yomi versus kun’yomi pronunciations. I’ve searched old posts with tips to figuring out when to use on’yomi and when to use kun’yomi. It looks like there are some tells that show you which one you’ll need. I’ll try to learn those over time, but I have question to make sure I’m on the right track.
Is this correct? Kanji with okurigana will typically use kun’yomi pronunciation. Numbers are an exception. Another seemingly random exception is 大した - which uses the on’yomi pronunciation of 大（たい）
Is there some tell for an exception like that or is it simply memorization? It seems kind of like English’s “i before e except after c…and also except for these dozen or so exceptions.”, but I want to make sure I’m not just misunderstanding before I try to commit it to memory that way.
TLDR: Are exceptions to using kun’yomi when okurigana is present just random memorization or is there a way to easily spot it? Example: 大した （たいした）