The decimal of 126 is simply 126. In decimal form, whole numbers remain the same, so 126 in decimal form is still 126. Decimal representation is based on powers of 10, where each place value represents a power of 10 (e.g. tens, hundreds, thousands, etc.).
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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 required decimal representation is 126, exactly as in the question.
.126
5.126 with a bar over the 126
0.571428 repeating 57.14%
5.04 = 126/25 = 5 1/25
Any number without a decimal point is a whole number.