We should not just ditch imperial measures, but switch to a hexadecimal number system (with elegant new numerals for 10-15, of course). Not only will arithmetic become much easier, we will also be able to remember 4x4 patterns, and define all 8x8 pixel images with 4 short words!
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Not I understand a thing
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When you perform mental addition, you have usually memorized the operations over single digits (=hashing), and for multiple digits, you exploit the power of log10 notation (even if you don't know that) and carry over whatever does not fit into single digits (=shifting).
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