The thing that started moving the needle on calculator pages was rewriting the first paragraph so that it was a complete answer to a single, literal question-no hook, no introduction. The template was, "The X for Y is Z, " and then one more sentence about the mechanism, and then one sentence mentioning the source. In about two months, the same pages started being cited by Google AI overviews or Bing chat, three or more times a month.
This surprising lesson is that voice search and answer engines value almost the same structure as is found in literal, first-line answers. Both technologies look for self-contained answer snippets. While it does not hurt the pages to rank high in classic SERPs, the answer had previously been hidden in setup text. Pages that buried the number ended up being entirely invisible to the new interfaces, even when traditional page ranks were completely unchanged.
We also saw that if you wrote out the name of the main source (the IRS publication number, the FRED series identifier, the BLS table) in the first 100 words, your page was 2.5 times more likely to be cited than if you wrote it out a few paragraphs later. Search technologies seem to factor in the distance of the source cite. The highest single point of use for our AEO data was the cite mentioned in the same paragraph/sentence as the number, then it was dumped at the bottom in an article's "Sources" section.
What I mean to say is that optimizing for voice and AI involves a ton of traditional journalistic standards. Start with the bottom line, give the main source close to the question, and keep units of meaning relatively compact so that they are readable in a single breath. It is simply a pattern that Google and Microsoft's AI now favor since it is the pattern that humans read the fastest.