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1、第5課時(shí) 8和9的加減法,2 + 4 =,7 - 3 =,3 + 4 =,1 + 6 =,4 + 3 =,7 - 4 =,6 - 5 =,6 - 1 =,4 + 2 =,4,6,7,7,7,3,1,5,6,7 1,6 2,5 3,4 4,8個(gè) 分成兩組，有幾種分法？,探究點(diǎn)1：8和9的分與合,（教材第52頁內(nèi)容）,用 擺一擺。,8 1,2,6 3,5 4,1,8,8,1,9,7,用 擺一擺。,8 1,2,6 3,5 4,7,1.,3,5,2,7,8,2,5,9,8,9,6,4,（教材P52 做一做1）,（教材P52 做一做2）,（1）圈出能組成8的兩個(gè)數(shù)。,（2）圈出能組成9的兩個(gè)數(shù)。,2.,

2、2 6 1 94 3 7 2 5 4 8 1,6 1 7 83 2 4 1 9 4 5 3,538,853,358,835,你是怎樣計(jì)算的？,探究點(diǎn)2：8和9的加減法,（教材第53頁內(nèi)容）,看圖你能列出哪些算式？,549,954,459,945,你是怎么計(jì)算的？,看圖列出兩道加法算式和兩道減法算式。,8,8,6,2,填一填。,填一填。,9,9,6,3,8,4,想一想。,（教材P53 做一做1）,7 + 1 =1 + 7 =8 1 =8 7 =,7 + 2 =2 + 7 =9 2 =9 7 =,8 + 1 =1 + 8 =9 1 =9 8 =,8,8,7,1,9,9,7,2,9,9,8,1,1.

3、,（教材P53 做一做2）,2.,第1盆有7朵花，第_盆和第_盆合起來有8朵花，第_盆和第_盆合起來有9朵花。,7,3,2,6,1,4,8,5,朵,1,第,2,3,4,5,6,7,8,盆,1,5,2,8,3,4,1,3,2,4,5,7,6,8,（教材P55 第6題）,5 + 4 = 9 4 =4 + = 9 =,9,5,5,9,5,4,（教材P55 第6題）,6 + 2 = 8 2 =2 + = 8 =,8,6,6,8,6,2,凡心所向，素履所往，生如逆旅，一葦以航。,I love you more than Ive ever loved any woman. And Ive waited l

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