6.4
How to do it:
You already have the whole number, which is 6, so what you have to do now to convert 2/5 as a decimal is divide 2 by 5, which = .4, so it would be 6.4
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The decimal version of three fifths is .6 (six tenths is the same as three fifths).
.4
0.4
six and four fifths written as a decimal = 6.86 4/5= 6 + (4 ÷ 5)= 6 + 0.8= 6.8
two fifths written as a decimal = 0.42/5:= 2 ÷ 5= 0.4 in decimal