Does telling time in Spanish always require me to use math? Like is it really necessary?

In English I never use the “quarter til” talk and I never use estimates but in a portion of my Spanish grammar book they’re adding and subtracting.

In my book, one section says to translate It is 3:35 p.m. so I wrote “ Son las tres y treinta y cinco de la tarde “ but the book says that Son las cuatro menos veinticinco de la tarde is the answer.

No way will I have to be doing math like that right ??😩 Was the answer I gave acceptable?

THANKS TO ALL THE HELPFUL RESPONSES 🫶