Between them, not including them it is 36.
If you include these two numbers, it would be 38.
Any number between 64 & 81 inclusive.
18/27 minus 44/81 is 10/81
118
The factors of 81 that are between 2 and 10 are 3 and 9.
45, 63, 81, 99 4 of them.
45, 63, 81, 99, 117
Eight: 45, 50, 55, 60, 65, 70, 75 and 80.
44+99+81+92= 316 316:4= 79 so 79
The only prime numbers between 81 and 90 is... 83
170 * * * * * No. These are numbers of the form AB00 (9*9 = 81 of them) C0D0 (81 of them), and E00F (81 of them). 243 in all.
number of composite numbers between 81 and 100 = 15composite numbers between 81 and 100 = 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99
125
Three: 83, 89, 97
Any number between 64 & 81 inclusive.
4,9,16,25,36,49,64,81
Techcially all numbers are divisible by 81, however many would result in a decimal answer. If you mean how many numbers are divisible by 81 and have an integer answer, then it is "all multiples of 81" - e.g 81 x 2, 81 x 3 etc...81, 162, 243 and keep adding 81 forever.
If you consider only whole numbers, then excluding both 26 and 208, there are 81 (=108 - 26 - 1). If all numbers, there are infinitely many.