In honor of an important and stressful day in the lives of many young Israelis today- the day of the national matriculation exam in math- we present you with an arithmetic lesson in the words of Thelma Eligon: "Two and two are four, four and two are six," this is the chapter on arithmetic. "My father's father is my grandfather", this is the chapter on logic and set theory, together with "the opposite of nothing is something". The song also contains an estimate: "a thousand trees is a forest" and a lesson in bases "there are five fingers on a hand". The main thing is the ending: "Anyone who wants to know should sing this song and they will learn". Good luck to all those taking the exam in math today. We recommend that you come to the exam with a song in your heart. A smile doesn't hurt, as well. The song is from the Hebrew translation of "Babar King of the Elephants" by Jean de Brunhoff.