It is a square number
Chat with our AI personalities
The square root of 81 is 9 which is a rational number
81% of 0.163 = 81% * 0.163 = 0.81 * 0.163 = 0.13203
129.6 = 0.81x x = 129.6/.81 = 160
Well, isn't that a happy little math problem? If 81 is 90 percent of a number, we can find the whole number by dividing 81 by 0.90. That would give us the number that 81 is 90 percent of. Just like painting, math can be a beautiful and calming experience.
It is: 3 and 81/100 as a mixed number