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a) 82,36 - 42,28 = (82-42)+(0.36-0.28)=40+0.08=40.08

b) 51,723 - 14,39= (51-14)+(0.723-0.39)=37+0.333=37.333

c) 184,3 - 12,26 = (182-12)+(0.3-0.26)=170+0.04=170.04

d) 80,3 - 4,217 = (80-4)+(0.3-0.217)=76+0.083=76.083

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