If you just deleted them from the home screen, find them in the app drawer (one at a time), long-press, then drag the app to the home screen that will show. (That creates a shortcut on the home screen, which is what you probably deleted.)
Edit. Woops. iPhone? For the future, you should know that we have an iPhone forum, also with an "ask a question" subforum,
iMore ask a question. So forget my answer, that's for Android.