What is 1.0342 rounded to the nearest tenth?

The tenth is the first number to the right of the decimal point (the 0).

So, the answer will be either      1.0     or     1.1

If the digit after the 0 is 4 or smaller, round down  -->  choose 1.0

If the digit after the 0 is 5 or more, round up  -->  choose 1.1

Since it is a 3, round down, and choose 1.0 for your answer.