We write .5 or 0.5 as the decimal for one half.
Half of 4.5 in decimal form is 2.25
We write two and a half as 2.5 in decimal form.
50 and a half cents as a decimal is 0.505
12 and one half as a decimal is 12.5
Half a dozen is 6.
87.5
0.5
It is 0.5
.5
7.5
3.5