The prime numbers are: 2 3 5 7 11 13 17 19 and 23 so it is 9/25
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45 and 25 are both integers, not fractions. 45 * 5/9 = 25.
The set of integers between -27 and 27 includes all whole numbers from -26 to 26, as it does not include the endpoints -27 and 27 themselves. This results in the set: {-26, -25, -24, ..., -2, -1, 0, 1, 2, ..., 24, 25, 26}. There are a total of 53 integers in this set.
I'll assume you meant factors. 5 x 5 = 25
0.812 = 812/1000 or 203/250 in fraction
If you mean: 23 25 and 29 then 23 and 29 are prime numbers while 25 is composite.