A half life may or may not be a fraction. The half life of carbon 14, for example, is 5715 years - not really a fraction, unless you are thinking in terms time periods which are much longer than a year.
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A half-life fraction is typically represented as a decimal or a percentage that indicates the fraction of a substance that remains after a certain amount of time has passed. For example, if a substance has a half-life of 2 hours and after 2 hours, only half of the original amount remains, the half-life fraction would be 0.5 or 50%.
One fraction half (as in the question) looks like 0.50 or 1/2 (one over two).
It looks like 21/2, though I am not sure what I can say about why!
a Decimal.
It is 100/1 as an improper fraction
FRACTION