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从逐步提升学生计算能力的角度来说,“8、7加几”是20以内进位加知识系统中具有承上启下作用的一个重要环节:一方面学生可以将用“凑十法”计算“9加几”的经验类推到“8、7加几”的计算中来,进一步掌握凑十计算的基本思考过程;另一方面,由于计算“8、7加几”时既可将8凑成10,又可将7凑成10,所以用“凑十法”计算“8、7加几”的过程又有助于学生丰富和加深对“凑十法”的理解,提高应用“凑十法”计算20以内进位加的能力。此外,在
From the perspective of gradual improvement of students’ computing abilities, “8, 7 plus a few ” is an important link in carrying knowledge and learning system within 20 degrees: on the one hand, students can calculate “ ”9 plus a few “ experience analogy to ”8,7 plus a few “ calculation, to further grasp the basic thinking process of computing ten calculations; the other hand, due to the calculation of ”8,7 plus a few“ When 8 can be made into 10, but also made up 10 7, so with ”Minato ten “ calculation ”8,7 plus a few “ process and help students to enrich and deepen the Ten Law ”understanding, improve the application “ Minato ten method ”to calculate the ability to carry within 20 plus. In addition,