115 in decimal form is simply 115. Decimal form is the standard numerical notation we use in everyday life, where each place value represents a power of 10. In this case, the "1" is in the hundreds place, the "1" is in the tens place, and the "5" is in the ones place.
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A decimal number is simply one in which the place value of each digit is ten times the place value of the digit to its right. There is no need for a decimal point and a 0 after the decimal point implies a degree of precision that is not warranted. So the answer to the question is 115, exactly as it appears in the question.