1/2
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It is 6/10.
5 years. A decade means 10 years, so to find out how many years are in half of a decade you would simply divide 10 by 2, which is 5.
A decade (10 years) is one hundredth of a millennium (1000 years).
1 because a decade is ten years so 15 is 1 decade and 5 years
5 years because it is half a decade.