They are:
30*20, 30*8, 2*20 and 2*8.
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30 x 20 = 600 30 x 8 = 240 4 x 20 = 80 4 x 8 = 32
32 and 160
(8 x 60) + (8 x 4) 480 + 32 = 512
Partial products of 87 times 65 would be 80 x 60 and 80 x 5 and 7 x 60 and 7 x 5. Partial products allow for the multiplication of whole numbers.
Expressed as a percentage, 28/32 x 100 = 87.5 percent.