Eight minus one and one ninth equals six and eight ninths.
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Twenty-eight ninths as a mixed number is 31/9
0.8 recurring
Well, darling, eight-ninths of 81 is simply 72. You just multiply 81 by 8/9 and you've got your answer. So, there you have it, 72 is the magic number.
Four fifths is less.
Expressed as a decimal, 8/9 is equal to 0.8 recurring, or 0.8888...