### DESIGNING A DIDACTICAL SITUATION ON SYMBOL SENSE OF MINUS SIGN IN LEARNING ARITHMETIC OPERATION OF INTEGER

#### Abstract

Mathematics textbooks are usually a reference for teachers to convey the material in

class. The existence of textbooks help teachers to facilitate the learning process

because their contain some descriptions of concepts, example problems, and

evaluations so that the concepts and flow of thought contained in the textbook can

guide teachers in the learning process. The study on mathematics textbooks of

primary and junior high school on the material negative numbers less meaning the

symbol of minus sign (symbol sense of minus sign) beforehand as the initial concept

of negative numbers so that students do not understand the meaning of negative

numbers at the next level. The learning process is more likely to emphasize the

procedure only that resulting in a leap of information and thinking experienced by

students. Finally, character of studentâ€™s thinking forced to jump from the concrete

into abstract thinking. Based on the results of a study conducted by researcher on the

students of seventh grade, the concept of negative numbers became an obstacle in

performing arithmetic operations of numbers. In integers which there are negative

integers in shows that most of them do not understand the meaning of the symbol

minus sign as a prerequisite to understanding arithmetic operations involving

negative integers. Therefore, teachers need to design a learning through a didactical

situation on symbol sense of minus sign which appropriate to the character of the

student's thinking.

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