It is simplest, not simpless. That means reducing the numerator and denominator so that they do not have any common factors.
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If you mean the ratio 12 : 14, then its simplest form would be 6 : 7.
4.012 is a fraction. The fact that it is expressed as a decimal does not mean it is not a fraction. As a ratio, it can be written as 4012/1000. You may simplify that ratio if you so wish.
It is a ratio.
Multiply the ratio by 100 and convert to decimal form (or convert and then multiply).
-6.59 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 equivalent, in the form of a ratio, is -695/100. You can simplify that ratio if you so wish.