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I find this method is far faster for quick calculation of large numbers off hand. Or at least estimation. Choose a close round number you do know the maths for, then just add or subtract the relevant parts to get it to true.
I find this method is far faster for quick calculation of large numbers off hand. Or at least estimation. Choose a close round number you do know the maths for, then just add or subtract the relevant parts to get it to true.
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