SO THAT IT WILL BE EASY FOR YOU TO UNDERSTAND SUBTRACTION SHORTCUTS
SUBTRACTION BY NUMBERS CLOSE TO 100, 200, 300, 400, ETC.
= 250 - 100 + 4 (Why adding? because the actual amount we have to subtract from 250 is 96. but we are subtracting 100. That means, we are subtracting 4 numbers more than we actually deserve. so our 250 will feel bad. so we should add that 4 to it:)

Subtraction of decimals
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