There’s a large gap between ‘fast enough to be a decent substitute for a LUT’ and ‘needs paper’. There’s no doubt that one needs to be ABLE to add 7+7+7, but I don’t think that each repetition on the path to memorizing 3*7=21 needs to involve it.
Does it take longer to ad 7+7+7 than to say “Seven times three is twenty-one” and “three times seven is twenty-one”?
if you have to memorize 3x7 and 7x3 separately, you’re doing it wrong
Really? Which one is in the standard form? How long does it take to convert the other into standard form, as opposed to doing the multiplication?
There’s a large gap between ‘fast enough to be a decent substitute for a LUT’ and ‘needs paper’. There’s no doubt that one needs to be ABLE to add 7+7+7, but I don’t think that each repetition on the path to memorizing 3*7=21 needs to involve it.
Does it take longer to ad 7+7+7 than to say “Seven times three is twenty-one” and “three times seven is twenty-one”?
if you have to memorize 3x7 and 7x3 separately, you’re doing it wrong
Really? Which one is in the standard form? How long does it take to convert the other into standard form, as opposed to doing the multiplication?