Irina Kleyman have been a teacher for 49 years. She have been a mother for 45 years now and grandma for 22 years. She knows how we love our kids and how we really care about their education. She loves Mathematics and Teaching and she wants to help teachers how to work with children. Teachers, you can help your children to get knowledge in Math. Irina Kleyman has a Masters Degree in Mathematics and Teaching of Mathematics. She was a teacher in Middle School and High School. Presently, she is a College Instructor and a University Lecturer. She has a big experience in American and European system of education. She was teaching with experience in 10 levels of Mathematics: Basic Skills, Basic Math, Beginning Algebra, Intermediate Algebra, College Algebra, Geometry, Trigonometry, Precalculus, Analytic Geometry and Calculus 1 and Analytic Geometry and Calculus 2. Knowledge and experience helped her to write textbooks for different levels of mathematics.