“上几去五进一”一类口诀,是珠算加法教学中的难点。如何教这类口诀,我区夫子庙小学范建国老师上的一堂珠算课,给我们以很多启发。范老师重点讲清第一句口诀,启发学生自己学习第二、三两句口诀;由学生根据所学到的知识,直接编出第四句口诀。讲授新课详略得当,重点突出,安排紧凑,讲练结合得很好。全班学生一直处在积极学习的气氛中,取得较好的教学效果。现介绍如下。一、复习师:同学们,今天这节课我们继续学习“珠算进位加法”(出示课题)。首先请大家进行“基本指法练习”。(学生按常规要求全盘练习,拨上并拨去:1、3、6、7、9。) 师:练得很好!同学们想一想:珠算加法口诀我们已经学过了哪几类? 生:珠算加法口诀我们已经学过了三类,第一类是“上几的”口诀,第二类是“下五去几”的口 “On a few past five into a” formulas, abacus adduction teaching difficulties. How to teach such formulas, my area Confucius Temple Primary School teacher Fan Jianguo abacus class, give us a lot of inspiration. Fan teacher to clarify the first sentence of the first sentence, to inspire students to learn the second and third sentence formulas; by students according to the learned knowledge, the fourth sentence directly compiled formulas. Lecture the new class is well-designed, focused, compact arrangements, well combined with the training. The class has been in an atmosphere of active learning and achieved good teaching results. Now introduced as follows. First, review division: Students, today we continue to learn this lesson “Abacus carry plus” (to produce topics). First of all, please everyone “basic fingering practice.” (Students practice as a general rule, dial and dial: 1,3,6,7,9) Teacher: Well practiced! Students think about it: Abacus Addition formula Which class we have learned? Students: Abacus Addition Formula We have learned three categories, the first category is “a few” formulas, the second category is “the next five to a few” mouth