1
The reason the answer is one is because in mathematics, when you divide something by a value you are literally saying, "How many of this number are in the other number?".
In this case "How many halves are in a half," which of course, is 1.
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0.05
Calculator, google or think like this; 2.5 is divisible by 5. So is .05. .05 divided by five is .01. 2.5 divided by 5 = .5. Answer = .51
0.05
5.8333
21