Gaussian elimination : this was missing in the 1990s Sijil Pelajaran Malaysia syllabus ... leading to a bit of a curiousity, where we studied matrix operations without being told wtf they were for. I only learnt that matrices were related to simultaneous equations several years later, as I was not focused on the study of math in my 20s and 30s.
Gaussian elimination is demonstrated in Chinese texts dated 0 +/- 180 CE.
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I was wondering where "elementary row operations" come from, and couldn't find any historical study of this. Then I watched a YouTube video by Jeff Suzuki, and realised they are indeed elementary ... and merely the arithmetic analysis of simultaneous linear equations covered in secondary school ( should be in primary, since it's just arithmetic ), but applied within the notational box of a matrix.
Now that after 25 years I have bothered to figure out what linear algebra is about, it makes a lot of sense that some countries teach this in elementary school. It's not that hard, when minimally approached from first principles.
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