3.18 IS a rational number. The fact that it is expressed as a terminating decimal does not mean it is not rational. As a ratio, it can be written as 318/100. You may simplify that ratio if you so wish.
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By leaving it alone because the whole number of 318 is already an integer
it can be written as a fraction
A rational number
1.5 is a rational number because it can be written as the ratio 3/2 7 is a rational number because it could be written as the ratio 7/1 3/4 is a rational number because it could be written as a fraction
Yes, 0.3 is a rational, for it can be written as a fraction. By definition, rational numbers are any numbers that can written as a fraction.