0.5
To figure it, you can do the division problem 1 divided by 2
If you use a calculator, just type it in; if by hand, do long division with:
_0.50___
2|1.00
So 1 divided by 2 is zero, subtract 1-0 = 1 bring down a zero, 10 divided by 2 is 5 with no remainder, so you're done. You can keep adding more zeros to the right until you have no remainder, or it starts repeating.
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We write .5 or 0.5 as the decimal for one half.
12 and one half as a decimal is 12.5
.5
1.5
11/2% = 0.015