9
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
One half times 81 is 40.5. This is calculated by multiplying 81 by 0.5, which gives you 40.5.
-9 or +9.
4 times 81 = 324
The two answers are -9 and +9.
81 + 16
81 raised to the 4th power is calculated as ( 81^4 ). Since ( 81 = 3^4 ), we can rewrite it as ( (3^4)^4 = 3^{16} ). Calculating ( 3^{16} ) gives us 43,046,721. Thus, ( 81^4 = 43,046,721 ).
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.)
The greatest common factor (GCF) of two numbers is the largest number that divides both numbers without leaving a remainder. To find the GCF of 81 and 256, you can use prime factorization. Prime factorizing 81 gives you 3^4, and prime factorizing 256 gives you 2^8. The common factors between 81 and 256 are 1, 3, and 9. Therefore, the GCF of 81 and 256 is 9.
To solve the equation ( 9d = 81 ), divide both sides by 9. This gives ( d = \frac{81}{9} ), which simplifies to ( d = 9 ). Therefore, the solution to the equation is ( d = 9 ).
1.25 grains in 81 milligrams. There are 0.0154324 grains per milligram. Multiply that by 81 gives 1.25.