Encyclopedia of mathematics  4 educational books and whiteboard pens as a free gift  If your child is weak in mathematics and you want a foundation course, we offer you the best simplified, innovative and unconventional curriculum that does not depend on memorization alone, but rather depends on understanding and comprehension.It contains many diverse problems and exercises with a simplified and gradual explanation.- Teaching addition (counting upwards - number line - adding a number - adding two numbers)- Teaching subtraction (counting backwards - number line - subtracting a number - subtracting two numbers)- Teaching division (explaining fractions - division up to 3 numbers)- Teaching the multiplication table.Specifications: 4 books, large size 35*25 - 250 grams sulfonated paper with a layer of plastic, waterproof and against cutting or damage. Possibility of writing and erasing more than 1000 times.