699.
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The sum of 123 and 654 is 777.
654.
6x12=72+654=726+555= 1281
1+23+456+7,890+987+654+32+1=10,044. You add it in bits: 1+23=24; 24+456=480; 480+7,890=8,370; 8,370+987=9,356; 9,356+654=10,011; 10,011+32=10,043; and 10,043+1=10,044.
-45 plus 512 plus 45 plus 56 = 568