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There are several. I would go for:

66 * 94 = (60 + 6)*(100 - 6)

= 60*100 - 60*6 + 6*100 - 6*6

= 6000 - 360 + 600 - 36 = 6204

You could go for (60 + 6)*(90 + 4) instead, but other than the fact that all components are positive, I see no advantage. The multiplications are much simpler if (100 - 6) is used.

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12y ago

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Q: What is the partial product method for 66x94?
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