-2 is an integer and so there is not a sensible way of expressing it as a fraction. One way is -2*k/k where k is an integer.
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The fraction 2/5 written as a decimal is 0.4
2.09 written as a mixed number is 2 and 9/100 and written as a fraction is 209/100
31.5= 63/2
Two fifths written in fraction form is 2/5
2.63 as an improper fraction is 263/100. As a mixed number it is 2 63/100.