8 1/5 - 3 4/10=
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\(||\ 8\frac{1}{5}-3\frac{4}{10}\\-------------\\\frac{4}{10}=\frac{4:2}{10:2}=\frac{2}{5}\\-------------\\||\ 8\frac{1}{5}-3\frac{2}{5}=7\frac{5+1}{5}-3\frac{2}{5}=7\frac{6}{5}-3\frac{2}{5}\\-------------\\7-3=4\\\frac{6}{5}-\frac{2}{5}=\frac{6-2}{5}=\frac{4}{5}\\-------------\\||\ \boxed{=4\frac{4}{5}}\)
8 + 1/5 = 40/5 + 1/5 = 41/5
3 + 4/10 = 3 + 2/5 = 15/5 + 2/5 = 17/5
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(8+(1/5))-(3+(4/10))
=(41/5)-(17/5)
=24/5
=20/5 + 4/5 = 4 + 0.8 = 4.8