小学数学统编教材第二册“100以内的加法和减法”一节,安排了“连加、连减和加减混合”的教学。其目的是通过教学让学生掌握连减、连加和加减混合式题的运算顺序,正确读出算式和书写竖式,正确计算100以内两步计算的连加、连减和加减混合式题,学会解答求总数的连加应用题以及求剩余的连 Primary mathematics textbooks teaching second volumes “100 addition and subtraction within the” section, arranged for “plus, even minus and mixed addition and subtraction” teaching. Its purpose is to teach students to master the order of addition, subtraction, addition and subtraction mixed-type operation, the correct reading of the formula and the vertical writing, the correct calculation of two-step calculation of less than 100 with the plus, minus, and addition and subtraction mixed Problem, learn to solve the total number of even plus application questions and find the remaining company