0.2 is a rational number. It can be written as 2/10
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1.25 IS a rational number. The fact that it is expressed as a decimal does not mean it is not rational. As a ratio, it can be written as 125/100. You may simplify that ratio if you so wish
8.98 IS a rational number. The fact that it is expressed as a decimal does not mean it is not rational. As a ratio, it can be written as 898/100. You may simplify that ratio if you so wish
Any number which can be written exactly with a limited set of figures is "rational". Numbers which cannot be written with a limited set, because the decimal number goes on for ever is "irrational". So 1.4 is rational because it takes only 2 figures to write its value exactly.
Yes because it can be expressed as a fraction
an irrarional number is a number that can't be written as a fraction or whole number. -sqrt(9)=-3 This is a whole number so it isn't irrational, just rational