Byron S. answered 10/06/14
Tutor
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Math and Science Tutor with an Engineering Background
You're multiplying here, and it looks like you're dealing with place values, so let's break each numbers we have up into their digits in their place values:
83 * 27
(80 + 3) * (20 + 7)
To multiply, we find the product of each part of the first times each part of the second, then add them all up:
80*20 + 3*20 + 80*7 + 3*7
1600 + 60 + 560 + 21