212/225
Yes it can it is an improper fraction.
6.672 is 6 672/1000. Simplified, it is 6 168/225.
-2.25 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 -225/100 which can be simplified, if required.
225 is an integer and cannot be simplified further.
22.5 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 225/10 which can be simplified, if required.
225 is an integer, not a fraction.
94/171
112.5 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 1125/10 which can be simplified to 225/2. But simplification will mean that you lose information about the precision of the fraction.
342% = 3.42 which is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 342/100. You can simplify that if you so wish.
3.23 as a simplified fraction = 323/100
0.62 as a simplified fraction is 31/50