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案例1:《表内乘除法》教学 在复习完了“表内乘除法”后,将教材中的练习“根据‘四七二八’这一句口诀写两道乘法算式和两道除法算式”改为“根据‘四七二八’这句口诀能解决哪些数学问题”,学生经过几分钟沉默,纷纷举手发言。 生1:运用乘法口诀可以求出4×7,7×4的积都是28。 生2:运用口诀可以求出28÷4,28÷7的商分别是7和4,由算除法可以想到乘法。 生3:运用口诀还可以求出7×3+7的和是28。
Case 1: “Multiplication and Division Table” teaching After reviewing the “multiplication and division within the table”, the exercises in the textbook “based on the formula of two seven multiplication and two division” written in “forty-seven twenty-eight” was changed to “According to '4772' this formula can solve what math problems,” after a few minutes of silence, students have raised their hands to speak. Students 1: The use of multiplication formulas can be obtained 4 × 7, 7 × 4 product is 28. Students 2: The use of formulas can be calculated 28 ÷ 4,28 ÷ 7, respectively, the 7 and 4, by the division can be thought of multiplication. Students 3: The use of formulas can also find the sum of 7 × 3 +7 28.