9 is the square ROOT of 81. Calculating a square root is the inverse operation of squaring a number.
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The meaning of "nine times nine is eighty one" is 9x9=81
One and eighty nine hundredths
There are eighty-one ninths in nine.
One thousand, nine hundred seventy-six and eighty-nine thousandths.
You could write 9.81 in a few ways: Nine point eight one Nine dollars and eighty-one cents (if referring to money) Nine and eighty-one hundredths