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六年制小学数学第四册第58页例5至例吕讲解“满五的”加法的各种情况，这一部分内容是珠算教学的一个难备现就个人的实践认识，提出如下教学建议。一、作好课前准备．减缓教学坡度1过好置换关。珠算“满五加”实质上是用了五进制。当两数和满五时，在算盘上置换为一个上珠。因
Example 5 to Example Lv Explain various situations of the “Full Five” addition. This part is a refresher of abacus teaching and is based on personal practice. The following teaching suggestions are made. First, make preparations before class. Slow teaching gradient 1 good replacement. Abacus “full five plus” is essentially a pentadecimal. When both numbers and full five, in the abacus on the replacement of a bead. because