Also in some countries the comma, not the dot, is the decimal separator, so I can see how somebody from such a nation who has also been exposed to the use of the dot as decimal separator, might thinl they both can be used like that and mean the same and not be aware that in English-speaking countries the comma is never used as decimal separator.
Mistaking a comma for a decimal point isn’t really what I’d call ‘math’.
Also in some countries the comma, not the dot, is the decimal separator, so I can see how somebody from such a nation who has also been exposed to the use of the dot as decimal separator, might thinl they both can be used like that and mean the same and not be aware that in English-speaking countries the comma is never used as decimal separator.