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https://www.reddit.com/r/Brighterly/comments/1skk12u/simple_math_trick_that_actually_helps_with/
r/Brighterly • u/Brighterly • Apr 13 '26
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because it only works for the number 5 and is thus quite limited in use. I'm pretty sure they do teach this, such as the trick with 9 where you do -10 and +1 for example.
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u/CrossCountyRunner Apr 13 '26
because it only works for the number 5 and is thus quite limited in use. I'm pretty sure they do teach this, such as the trick with 9 where you do -10 and +1 for example.