4/10 as a decimal is 0.4
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4/5 as a decimal is 0.8
2/5 multiply times 2(because .1=1/10). that equals 4/10 in decimal form that is .4(again, because .1=1/10).
It is 0.4
0.4
divide 4 by 54/5 x2= 8/108/10 as a decimal is 0.80.8