A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the decimal representation of 42 is 42, exactly as in the question.
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0.42 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 rational form, is 42/100. You can simplify this rational fraction if you require.
4.2% = 0.042
The decimal of 4.14 is equivalent to 4.140 as a decimal
.42 is smaller than .428
42/11 = 3.8181 . . .