Assuming you mean $12.91, you don't have to round to the nearest cent. It is already in the standard form that money is in.
The answer depends on the units used for 91.
It rounds to 91
In this case, you would round DOWN to 91.
100
90.
The answer depends on the units used for 91.
It rounds to 91
9 is the tens digit; 1 is less than 5 so round down. 91 rounded to the nearest ten is 90.
321.98%
In this case, you would round DOWN to 91.
4100 because 91 is greater than 50
To round 91 to the nearest hundred, you need to look at the digit in the tens place, which is 9. Since 9 is greater than or equal to 5, you will round up. Therefore, 91 rounded to the nearest hundred is 100.
90
100
90.
12 x 91 = 1092
12 divided 91 = 0.13186813186813187