8.1 million means 8.1 times 1 million
1 million is 1,000,000
→ 8.1 million = 8.1 x 1,000,000
= 8,1000,000
which is eight million one hundred thousand.
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81 percent as a fraction in lowest terms is 81/100
81 over 100 is already in lowest terms as a fraction.
81 million
Without an equality sign the given terms can't be considered to be an equation but if you mean 3d = -81 then the value of d works out as -27 by eliminating the 3 and dividing it into -81
Assuming you mean the arithmetic mean, it is 80.