well 5.16 is already a decimal
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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 516, exactly as in the question.
516 + 2000 = 2516. It is an integer so there is no need for a decimal point.
It is in decimal form.
This is in decimal form.
That IS the decimal form.