A rational number is one that has an ending.
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It is neither but if you mean the square root of 100 then it is 10 which is a rational number
If you mean 213 then it is a rational number because all integers or whole numbers are rational numbers.
1.5 is a rational number as it is. If you mean expressing it as a ratio: try 3/2
0.3 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 3/10.
4.7 is already a rational number. If you mean as a mixed number, this is equal to 4 7/10 or four and seven tenths.