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it’s route memorization without doing this this way I mean people can explain the answer but they have difficulty explaining why it’s true or the intuition… all they’re doing is breaking the numbers down into smaller units of representation to make it easier and it’s supposed to help people think of math not as literals but abstractly so that say when you find yourself in a real world situation that calls for math like say You’re a Cashier and the customer Rings up at 57.55 and Hands you a 100 dollar bill in your head the register is going to spit out FOR You that it’s 42.45 in change and to get there you have to break the 42.45 apart. so two twenties = 40 + 2 one dollar bills = 42. + a quarter 42.25 + two dimes = 42.45.

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