摘要：As it is known; the mathematical concepts are connected like rings of the chain so a rupture in
the chain will cause difficulties in teaching mathematics concepts in the future. Especially, this ring is seen
between the arithmetic and algebra knowledge in the first and second level of primary schools. Though there
is a strong relation between arithmetic and algebra; because of their different natures there are differences in
interpreting letters, symbols, mathematical statements, equal concepts and problem solving methods. So prealgebraic
period that is the period transition from arithmetic to algebra development is so important in
eliminating obstacles and difficulties which are caused from these differences. For this reason, it is necessary
to deal with these differences and the importance of pre-algebraic period. In this study we focused on the
differences between arithmetical and algebraic knowledge and the importance of pre-algebraic period.
