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followed by addition to obtain 442, either in a single sum (see right), or through forming the row-by-row totals
: (300 + 40) + (90 + 12) = 340 + 102 = 442. This calculation approach (though not necessarily with the explicit grid arrangement) is also known as the [[partial products algorithm]]. Its essence is the calculation of the simple multiplications separately, with all addition being left to the final gathering-up stage.
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