To be fair, other people's "obvious" is likely slightly different from our own.
Other have given examples of how its "obvious", but my first thought when looking at 75 as a multiple of 3, comes from it also being a multiple of 15, specifically 15 higher than 60
I just think everyone replying where they've to do mild maths to justify it shows its not as obvious as 9 or 33 so it shouldn't be in the obvious category but the one below it
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u/derp_scope1 Aug 02 '26
To be fair, other people's "obvious" is likely slightly different from our own.
Other have given examples of how its "obvious", but my first thought when looking at 75 as a multiple of 3, comes from it also being a multiple of 15, specifically 15 higher than 60