The   DinaMath   series of text books was designed to respond to the failings of the     modern   American   math   curriculum   and   to     provide   parents with a supplement     (or a replacement)   to   ensure   that   their   children   learn   basic   mathematics   well     enough   to   succeed in algebra,   trigonometry, and calculus.   A good   knowledge of     arithmetic is essential for these advanced subjects; also,   arithmetic is the part   of math     that is most useful in everyday life.   Clear, coherent   explanations,   plentiful   examples     and practice   problems,   and amusing   pictures   make these books useful and fun for     students.         The second book in the series, "Fractions and More", takes up where the first book     left off.   The   book   begins with   multiplication   and   division of large numbers, and     then goes on to basic   number theory:  factors,  multiples,  divisibility,  prime numbers,     prime factorization, and greatest common factor and least common multiple. Only after     covering   these   concepts   in detail   does   the book   proceed   to fractions. All four     arithmetical   operations   with   fractions   are discussed   and explained in detail. After     fractions, the book covers decimals, then integers, and the last chapter  contains mixed     problems - fractions   and   decimals   together in the same   calculation.   As in the first     book,    every    topic  is   accompanied   by numerous  word   problems  to   facilitate     understanding.         The book   consists   of two   parts: a   Textbook and a   Workbook. The textbook     contains   explanations,  examples, and a few practice problems for   each lesson. The     workbook   contains problem   sets to   accompany each lesson and answers to all the     problems.