I am having trouble solving these two problems. Can someone help me figure out how to do it?

I am having trouble solving these two problems. Can someone help me figure out how to do it? I don't just want an answer I would like to see the work on how this is done.

Calculate the value of the error (only) with two decimal places for:  

(7.3 +/- 0.3) / (3.5 +/- 0.3)

Calculate the value of the error (only) with one decimal place for: 

(20+/- 13%) × (34 +/- 9%)