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 56, exactly as in the question.
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56 is in decimal form. You could write it as 56.0
56 metres is a perfectly good decimal.
.56
56/100 written as a decimal is 0.56
56.00 or 56 / 100 = 0.56 (56%)