1、歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,退位減法,蘇教版二年級(jí)數(shù)學(xué)下冊(cè),歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,下一步,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,1 2 5,答：兒童小說比童話多（125）本。,兒童小說比童話多多少本?,335-210,125,我來列豎式,（本）,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!th

2、ank you!thank you!thank you!,我來驗(yàn)算。,5,2,1,3 3 5,驗(yàn)算方法：用差加減數(shù)（得出的答案等于被減數(shù)，那么計(jì)算正確，否則錯(cuò)誤）。,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,0,答：一共借書150本。,5,1,兒童小說比民間故事多多少本?,335-185=,150,哪一位不夠減,就從前一位退“1”，退“1”當(dāng)“10”.,（本）,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,你還能提出哪些數(shù)學(xué)題？,民間故事比童話少多少本?,210-185=（ ）（本）

3、,5,2,0,當(dāng)0出現(xiàn)在數(shù)的最高位時(shí)，這個(gè)0不寫。,答：民間故事比童話少25本,25,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,3 8 6 - 9 8 7 3 4 - 3 6 6,（用豎式計(jì)算并驗(yàn)算）,8,8,4,8,2,6,8,3,6,3,3,7,1,1,驗(yàn)算,1,1,驗(yàn)算,2 8 8 + 9 8,3 6 8 + 3 6 6,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,3,6,7,8,8,2 4 7,- 1 8 4,9 7 2,- 8 5,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!t

4、hank you!thank you!thank you!,6 7 5 - 3 4 2 7 6 1 - 5 3 6,試一試（用豎式計(jì)算并驗(yàn)算）,3,5,1,3,3,5,7,6,2,2,6,7,1,驗(yàn)算,驗(yàn)算,3 3 3 + 3 4 2,2 2 5 + 5 3 6,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,我們一班共收集了254節(jié)廢電池。,我們二班比你們少收集了69節(jié)。,二班共收集了多少節(jié)？,254-69=185（節(jié)）,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,小蝸牛找家,283,

5、492,108,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,努力吧！,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,我的身高是610厘米,我比長(zhǎng)頸鹿矮370厘米。,小馬的身高是多少厘米？,610-370=240（厘米）,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,我已經(jīng)跑了90米。,我已經(jīng)跑了70米。,我已經(jīng)跑了40米。,誰跑得快？每只動(dòng)物還要跑多少米才到游泳池？,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,森林醫(yī)生,338 195 243,931 894 163,526 - 227 309,歡迎來訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,試一試,459-181,638+315,