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 79 is 79, exactly as in the question.
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79 = 1001111
8 and 79 hundredths in decimal form is 8.79
79%= 0.79
79/80 = 0.9875
79/1000 = 79 ÷ 1,000 = 0.079