The word(s) "add" appears 48 time(s) in 46 verse(s) in Quran in Abdullah Yusuf Ali translation.

(21) And pray in the small watches of the morning: (it would be) an additional prayer (or spiritual profit) for thee: soon will thy Lord raise thee to a Station of Praise and Glory!

(22) "Or thou have a house adorned with gold, or thou mount a ladder right into the skies. No, we shall not even believe in thy mounting until thou send down to us a book that we could read." Say: "Glory to my Lord! Am I aught but a man,- a messenger?"

(23) Without adding, "So please Allah!" and call thy Lord to mind when thou forgettest, and say, "I hope that my Lord will guide me ever closer (even) than this to the right road."

(24) So they stayed in their Cave three hundred years, and (some) add nine (more)

(25) Say: "If the ocean were ink (wherewith to write out) the words of my Lord, sooner would the ocean be exhausted than would the words of my Lord, even if we added another ocean like it, for its aid."

(26) Nay! We shall record what he says, and We shall add and add to his punishment.

(27) "add to my strength through him,

(28) So he broke them to pieces, (all) but the biggest of them, that they might turn (and address themselves) to it.

(29) And We bestowed on him Isaac and, as an additional gift, (a grandson), Jacob, and We made righteous men of every one (of them).

(30) In addition there will be maces of iron (to punish) them.