for a sum of 10.1955 do I round up or leave it as is
That depends upon your instructions. Rounded to the nearest tenth, it's 10.2.
Thank you Ms Sue
You're welcome, Jimbo.
To determine whether to round up or leave a sum as is, you can follow these general rounding rules. Firstly, look at the digit immediately to the right of the desired level of precision. In this case, since you want to round to the nearest hundredth (two decimal places), you need to look at the third decimal place.
If the value at the third decimal place is 5 or greater, you round up. If it is less than 5, you leave the number as is. In this case, the digit at the third decimal place is 9, which is greater than 5, so you would round up.
Therefore, for a sum of 10.1955, you would round it up to 10.20, keeping two decimal places.