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0.5, 0.5, 0.5, 0.5, 0.5.
Yes.
We write .5 or 0.5 as the decimal for one half.
To write the number fifteen and one half in numbers you could write it as: 15 1/2 or as 15.5
3.5 or 7/2 or 3 and 1/2 Seven halved is three and a half; three and a half times two equals seven.