ついでに
Usage
「のついでに…」means "to do ... as well while doing -" The main purpose is -
(読む/読んだ/Nの) + ついでに
Examples
散歩に行くついでに、牛乳を買ってこよう
Lets get some milk while we are taking a walk
買い物のついでに、この手紙を出してきてよ
Could you post this letter while you're out shopping?