《十幾減876練習(xí)》PPT課件.ppt

十幾減8、7、6練習(xí),新人教版數(shù)學(xué)一年級(jí)下冊(cè),基礎(chǔ)練習(xí),127=,118=,136=,157=,189=,167=,7 + 5=,178=,146=,8 + 9=,116=,159=,5,3,7,8,9,9,12,9,8,17,5,7,157=8,189=9,116=5,個(gè)位不夠減，要用退位減；個(gè)位能夠減，不用退位減。,11 9 =,12 9 =,13 9 =,14 9 =,15 9 =,16 9 =,17 9 =,18 9 =,你發(fā)現(xiàn)了什么？,2,3,4,5,6,7,8,9,11 9 = 2 12 9 = 3 13 9 = 4 14 9 = 5 15 9 = 6 16 9 = 7 17 9 = 8 18 9 = 9,。,十幾減9，是幾加1,11 8 =,12 8 =,13 8 =,14 8 =,15 8 =,16 8 =,17 8 =,你發(fā)現(xiàn)了什么？,3,4,5,6,7,8,9,11 8 = 3 12 8 = 4 13 8 = 5 14 8 = 6 15 8 = 7 16 8 = 8,。,十幾減8，是幾加2,11 7 =,12 7 =,13 7 =,14 7 =,15 7 =,16 7 =,你發(fā)現(xiàn)了什么？,4,5,6,7,8,9,11 7 = 4 12 7 = 5 13 7 = 6 14 7 = 7 15 7 = 8 16 7 = 9,。,十幾減7，是幾加3,破十法兒歌,退位減，我會(huì)算 十幾減9，幾加1， 十幾減8，幾加2， 十幾減7，幾加3， 十幾減6，幾加4，,書(shū)本P15.3,138=5,158=7,168=8,128=4,118=3,148=6,178=9,108=2,127=5,147=7,167=9,137=6,117=4,157=8,116=5,156=9,146=8,166=10,136=7,138=5,158=7,168=8,128=4,118=3,148=6,178=9,108=2,127=5,147=7,167=9,137=6,117=4,157=8,116=5,156=9,146=8,166=10,136=7,我會(huì)算！,7,12,15,7,9,2,6,14,14,18,4,13,書(shū)本P16.7,5,8,9,11-6=5,15-7=8,18-9=9,6,12,-,6,6,一個(gè)數(shù)加上7，它的得數(shù)比15小比11大，請(qǐng)問(wèn)這個(gè)數(shù)是幾？,我最聰明,( ) + 7 < 15,11<,12,13,14,( ) + 7 =12,( ) + 7 =13,( ) + 7 =14,6,5,7,換獎(jiǎng)品,兒童時(shí)代,8分換一本,兩次得分夠換一本嗎？,還多幾分？,6+7=13（分）,13-8=5（分）,答：兩次得分夠換一本，還多5分。,