Depending how you read this question it is either 81/100 of 1 which gives 0.81% or it is 81 of 100 which gives 81%.
92 = 81
-9 or +9.
4 times 81 = 324
The two answers are -9 and +9.
The number 9 !
81 + 16
Use your calculator to calculate the square root of 81. Or use trial-and-error, to see which number, when multiplied by itself, gives you 81. (Hint: In this case, it is an integer.)
1.25 grains in 81 milligrams. There are 0.0154324 grains per milligram. Multiply that by 81 gives 1.25.
Consider the unit's digit when you multiply 9 n times. n = 1 gives 9 n = 2 gives 1 n = 3 gives 9 n = 4 gives 1 and a pattern emerges. When n is even, as 100 is, the answer is 1.
The formula for converting from Fahrenheit to celsius is as follows: C = (F-32) x5/9 So in this case it would be: 1. 113-32 which gives 81 2. 81 x 5 gives 405 3. 405 / 9 gives 45 So the answer is 45 degrees Celsius
Divide the 81 pi by pi, then square root it. (Use the formula for area of circle, which gives 81pi=pi*radius squared, but rearrange to find the radius). i.e. it's the square root of 81