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Originally Posted by
Optimus Prime
It takes me too long to mentally divide, say, 17 by 4.5 - quick is it 3 or 4?
The multiples of 9 you learned by rote as a group in elementary school are the even multiples of 4.5. Assuming flooring that is all you need to know to get the answer instantaneously without using math. The second multiple of 9 is 18 (also the second even multiple of 4.5 which is the TC +4 RC barrier). Since the RC of +17 is closer to 18 (The second even increment of 4.5 or TC +4) than 9 (The first even increment of 4.5 or TC +2) and in between them, so the TC is floored to TC +3. You do this for a while and you know the TC instantaneously every time without even thinking about it. No math since you learned the multiplication tables by learning all the multiples of each number as a group. Your brain already has the increments in your head. You just need to use the increments as a mental ruler. For half decks you use double the deck estimate to get the even TC increments as I demonstrated here. Doing it this way you have instantaneous TC recognition without doing any math. You just put the RC to the mental ruler that was engrained into your memory when you first learned to multiply numbers. instant TC recognition.
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