Six hundred and eighty thousand seven hundred and five
The partial products are:
42 x 28 = (40 + 2) x (20 + 8)
42 x 28 = 40 x 20 + 40 x 8 + 2 x 20 + 2 x 8
42 x 28 = 800 + 320 + 40 + 16
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4s + 20 is the correct distribution of the 4.