Assuming you mean $1.389, you would round to two decimal places, as there are 100 cents in a dollar, and two decimal places is the hundredth place. 9 is greater than 5, so this number rounds to 1.39.
435.38
If that's 325 cents, it's 325 If that's 325 dollars, it's 325.00 If that's 3.25, it's already there.
236.6
83333
6790
20.1
It is: 110
It is: 58.1
It is 1000000.
It is: 5.7
8.1
31.8