Respuesta :

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

Hope I Helped You!!! :-)

Have A Good Day!!!
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