Do you mean what is four and one fifth in a decimal, or one fourth and one fifth in a decimal form? I'll give you either answer anyway:
4 1/5 = 4.2
1/4 = 0.75 and 1/5 = 0.2
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Expressed as a decimal, 4 1/5 is equal to 4.2.
4 and 1/5 is 4 and 2/10 is 4.2
2/5 = 4/10 = 0.4
4.2 is the equivalent decimal fraction.
One fifth as a decimal is 0.20 One fifth as a percentage is 20%