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Hard disagree. The multiplication table is incredibly useful when making back of the envelope calculations. You can cheat though. 2, 5, 9, and 11 have simple d
by tovej 5y ago
Hard disagree.
The multiplication table is incredibly useful when making back of the envelope calculations.
You can cheat though. 2, 5, 9, and 11 have simple deterministic algorithms you can apply to get the result. These help, but the multiplication table is one of the only useful maths concepts that's stuck with me from grade school.
- lupire 5y agoBack of the envelope means you can estimate so you don't need it memorize the whole table.
- mdp2021 5y agoYou need those key→value promptly available when you are actually performing the "back of the envelope" computations.
- commandlinefan 5y agoI've gotten pretty good at deconstructing (a+b)c into ab + ac and working that out in my head - for example, 36 x 3 is (30+6) x 3 = (30 x 3) + (6 x 3) = 90 + 18 = 108. Couldn't do it if I didn't remember the multiplication tables up to 10 though.