The word(s) "add" appears 36 time(s) in 32 verse(s) in Quran in Mohsin Khan translation.

(11) And when they opened their bags, they found their money had been returned to them. They said: "O our father! What (more) can we desire? This, our money has been returned to us; so we shall get (more) food for our family, and we shall guard our brother and add one more measure of a camel's load. This quantity is easy (for the king to give)."

(12) Those who disbelieved and hinder (men) from the Path of Allah, for them We will add torment to the torment because they used to spread corruption [by disobeying Allah themselves, as well as ordering others (mankind) to do so].

(13) Set not up with Allah any other ilah (god), (O man)! (This verse is addressed to Prophet Muhammad صلى الله عليه و سلم , but its implication is general to all mankind), or you will sit down reproved, forsaken (in the Hell-fire).

(14) And your Lord has decreed that you worship none but Him. And that you be dutiful to your parents. If one of them or both of them attain old age in your life, say not to them a word of disrespect, nor shout at them but address them in terms of honour.

(15) And in some parts of the night (also) offer the Salat (prayer) with it (i.e. recite the Qur'an in the prayer), as an additional prayer (Tahajjud optional prayer - Nawafil) for you (O Muhammad صلى الله عليه و سلم). It may be that your Lord will raise you to Maqam Mahmud (a station of praise and glory, i.e. the honour of intercession on the Day of Resurrection.) .

(16) And they stayed in their Cave three hundred (solar) years, adding nine (for lunar years). (Tafsir Al-Qurtubi)

(17) So We revealed to him (saying): "Construct the ship under Our Eyes and under Our Revelation (guidance). Then, when Our Command comes, and water gushes forth from the oven, take on board of each kind two (male and female), and your family, except those thereof against whom the Word has already gone forth. And address Me not in favour of those who have done wrong. Verily, they are to be drowned.

(18) That Allah may reward them according to the best of their deeds, and add even more for them out of His Grace. And Allah provides without measure to whom He wills.

(19) And the (faithful) slaves of the Most Gracious (Allah) are those who walk on the earth in humility and sedateness, and when the foolish address them (with bad words) they reply back with mild words of gentleness.

(20) And if all the trees on the earth were pens and the sea (were ink wherewith to write), with seven seas behind it to add to its (supply), yet the Words of Allah would not be exhausted. Verily, Allah is All-Mighty, All-Wise.