AL Khwarizmi is one of the most famous mathematicians in the world. This was in the 6th century and Khwarizmi left behind many publications in astronomy, geography, science, the most important book of algebra and many more. His algebra book, composed of two main sections, contains the first two algebraic theories, dedicated to the theory of equations and algebraic calculations, as well as to the resolution of the various problems posed by this theory and applied to engineering problems . Additionally, many theories are taught today in mathematics and other sciences such as engineering and computer science. After Khwarizmi, mathematics developed and became important in life. Mathematics is the science - undisputed - the backbone of most modern sciences, which some people think they do not need to use mathematics in everyday life, but if they look into their life, they can find many applications. According to Man Keung in the article “Mathematics: What Does It Have to Do with Me?” » “In fact, we fundamentally live in a world of mathematics. Mathematics is “present in our environment, directly or indirectly affecting our daily lives. Its past, its present or, we can even predict, its future will always be fascinating and exciting” (91). This quote means that mathematics is everywhere in people's lives, from the past to the future. For example, they use mathematics when they want to go shopping. When a person gives money to a seller, the seller does some calculations and takes the rest of the money. In this situation, people use one or more operations such as addition, subtraction, multiplication or division. Another example of using mathematics in daily routine is problem solving. If a person has a problem, he must use logic. Logic is the science that studies the general rules and laws of the human right to think. People use logic to see if something is good or bad. When they start to solve the problem, they need to think about different solutions and adopt the best solution they found. If students have a difficult assignment, they should focus on their assignment until they understand, which shows the use of logic. Overall, here are some math apps that people use every day.