If you mean, (by rational form), in the form "p/q", let p= -2 and q = 1
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12.52 is rational, as is any number that you can write out completely in decimal form.
200 is an integer and not a fraction. However, it can be expressed in rational form as 200/1.
Answer: 1 already is a rational number. If you want to get technical, you could write it as 1/1. Answer: Any integer is a rational number. No matter how you write it, it will still be a rational number. Answer: 10/10, 2/2, 3/3, 365/365, etc.
The simplest way is to write it as -0.2 which is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is -2/10 which can be simplified, if required.
2.4 is a rational number because it can be expressed as an improper fraction in the form of 12/5