My missus just tore your post apart, but I'd get a holiday for writing what she said. She advised you to go read the maths curriculum then come back and comment. Rounding is one of the methods taught, as is tens and ones. It's about teaching a variety of methods as not all children will understand all methods and it gives them all a good base.
Like I could care what your missus or any other 'teacher' could think, when its entirely their fault that kids today are unemployable due to their illiteracy and poor numeracy skills. Her 'tearing me apart' obviously shows how poorly her language skills must actually be to be able to explain her point calmly, I really hope this isn't a someone that is also being allowed anywhere near kids!
Of course teachers are going to defend their outdated and proven useless methods despite however much evidence shows that kids are leaving school ill prepared for todays highly competitive job markets.
I've already heard and seen it enough times, most people become teachers as a backup plan after failing to become the next best environmental activist with their geography degree or some such. They are hardly an unbiased source on how amazing they think the education system is.
Everyone today is taught at the lowest levels possible and with declining and easier pass requirements so that everyone has a lovely fair and equal chance of becoming the next doctor. Then we wonder why we end up needing to hire our doctors from other countries instead, like hurr meet durr!
As for your claim that teachers teach 'multiple methods', the question in the OP doesn't look like 'multiple methods' to me, and I wonder who is wrong when neither the kids nor their parents, or most people on multiple internet forums can even understand it?
Never mind, lets just keep blaming it on dumb kids and bad parents, surely its never the teacher's fault for never being able to properly teach such airy fairy woke methods.
I could actually have become a teacher very easily and likely still could. Let that sink in before you continue holding teachers to such a high regard.
