Actually spend some time with 6 year olds; tell me they can't learn all that and more inside of a month. Learn some actual math concepts (you likely know none; you know operations). Try teaching them to a child. Read the Mathematician's Lament. Stop parroting stupid tropes.
If you want to learn the separate skill of fast "napkin math" or estimation, there are plenty of more interesting and gamifiable ways to do that, utilizing the parts of your brain that actually reinforce what you're learning rather than slog on through.
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Are you very engaged with how maths is taught in schools today? Are you very engaged with how middle and lower ability students learn?
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I will never, ever use the phrase "lower ability student" either to that child's face or when speaking about them. Get out.
End of conversation
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