I have a hard enough time concentrating on 'easy' things , please don't ask me to hold numbers in my brain. I am a pretty "mathy" person but mental multiplication is not meant for the human thought process, too much is going on.
That's like saying humans were never meant to run up stairs so you're taking the elevator. In any case, nobody's asking yo to hold numbers in your brain; it's OK to use paper and pencil for your calculations, as generation after generation of mathematicians did.
That's like saying humans were never meant to run up stairs so you're taking the elevator. In any case, nobody's asking yo to hold numbers in your brain; it's OK to use paper and pencil for your calculations, as generation after generation of mathematicians did.