\(53\cdot11=53\cdot\left(10+1\right)=530+53=583\)
\(39\cdot101=39\cdot\left(100+1\right)=3900+39=3939\)
\(8\cdot19=8\left(20-1\right)=160-8=152\)
\(65\cdot98=65\cdot\left(100-2\right)=6500-130=6370\)
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