123 + 456 + 7890 = 8469
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Rounding just the solution to the nearest thousand, 123 + 456 is approximately equal to 1000.
123456 - 7890 = 115,566
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.
123 - T19, T16, D9
456 plus what equals 1242.\