Csányi, PetraFábián, KataSzabó, CsabaSzabó, Zsanett2024-09-042024-09-042015-12-01Teaching Mathematics and Computer Science, Vol. 13 No. 2 (2015) , 209-2231589-7389https://hdl.handle.net/2437/379786We investigate how Hungarian highschool textbooks handle basic notions and terms of number theory. We concentrate on the presentation of the fundamental theorem of arithmetic, the least common multiple and greatest common divisor. Eight families of textbooks is analyzed. We made interviews with the authors of four of them. We conclude that a slightly more precise introduction would not be harmful for pupils and could bring basic number theory closer to them.application/pdftextbooknumber theorygreatest common divisorfolyóiratcikkOpen AccessPetra Csányi, Kata Fábián, Csaba Szabó and Zsanett Szabóhttps://doi.org/10.5485/TMCS.2015.0397Teaching Mathematics and Computer Science213Teach. Math. Comp. Sci.2676-8364