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Anonymous
Let's break this problem down
19 = 10 + 09
900 = 9 x 100
So,m if we multiple 10 by 9, and then 9 by 9, we can add the results and multiply the total by 100
10 x 9 = 90
09 x 9 = 81
90 + 81 = 171
171 x 100 = 17,100
So, 19 x 900 = 17,100
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