21.06
566 ÷ 81 = 6.987654321 (Or 566 ÷ 81 = 6 remainder 80.)
1, 3 and 9
0
No, 82 is not a multiple of 9 because 9 can not be multiplied by any whole number to get 82. (9x9=81, 9x10=90, there is no 82 in between).
Anything you want to be multiplied by 81.
23 percent of 81 is 18.63.
21.06
The simple, but crude, estimate would be 80*400 = 32000 which is 3.4% off the correct answer of 33129. I would go for 80 * 410 which is 32800, which is less than 1% off. When multiplying, if you round one number up, you round the other down.
The number that multiplied by 32 would equal 81 is 2.53125.
3 x 81 = 243
81 multiplied by 38 is 3,078.
81 multiplied by 324 is 26,244.
569 multiplied by 81 is 46,089.
81 multiplied by 18 is 1,458.
27 multiplied by 81 is 2,187.
71 multiplied by 81 is 5,751.