How do round 1.55 to one decimal place?

Answer 1

You have 1.55 and you want to round to the first place. So add 0.05 as follows

1.05

0.05

____

1.10

____

And the answer is 1.1

You always add a number preceded by as amny zeros as required followed by a 5

to the right of the position to which you want to round off and then truncate the entire answer to the required precision (or place)