发明背景:我们刚接触有理数时,对有理数的定义、计算都搞不太清楚,进行有理数加减运算时总爱运用之前学过的加减运算法。有些同学即便掌握了有理数加减运算法,计算时也常出错。有理数加减法是六年级数学学习的重点和难点,于是,我设计制作了有理数(整数)加减法计算尺。设计原理:有理数(整数)加减法计算尺引用了数轴、线段的加减运算。研究过程:我先尝试设计了有理数(整数)加 Background of the Invention: When we first touched on rational numbers, we did not understand the definition and calculation of rational numbers, and we did not know the rational addition and subtraction algorithms that we had learned before using and subtracting rational numbers. Some students even mastered the rational number addition and subtraction algorithm, calculation often mistakes. Rational addition and subtraction is the sixth grade mathematics learning focus and difficulty, so I designed a rational number (integer) addition and subtraction algorithm slide rule. Design Principle: rational number (integer) addition and subtraction Slide rule reference to the number of axes, line addition and subtraction operations. Research process: I first tried to design a rational number (integer) plus