Who checks the maths
Every calculator and every explainer is reviewed for accuracy before it is published, and dated so you can see when it was last checked.
Who reviews the content
Aziza Smailović has spent decades teaching mathematics and physics, first in school institutions across the Balkans, including Bosnia and Herzegovina, and now from New Jersey. She holds Praxis certification in mathematics, has written a book and a periodical, and has been teaching online for over ten years through her own physics platform. She reviews every calculator and every explainer on this site before it is published.
Review, not tuition
Her role here is to confirm that the mathematics is correct, that each step is justified by the rule named beside it, and that the common mistakes listed are the ones learners actually make. She does not answer individual questions through this site — MathNana is built so that is not necessary. If you want one-to-one teaching, that is what her tutoring practice is for, and it is a separate thing entirely.
What a review covers
The result itself; every intermediate step; the wording of each rule shown in the margin; the edge cases where a calculator should decline to answer rather than guess; and whether the explanation would make sense to somebody meeting the topic for the first time. That last test is the one that fails most often, and it is the reason the common mistakes sections exist at all.
When pages are re-checked
Whenever the underlying calculator changes, and on a rolling schedule otherwise. The date shown on each page is the date of the last completed review, not the date the page was first written.