1、十幾減8、7、6練習(xí),新人教版數(shù)學(xué)一年級(jí)下冊(cè),11 9 =,12 9 =,14 9 =,15 9 =,17 9 =,18 9 =,你發(fā)現(xiàn)了什么？,2,3,5,6,8,9,11 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1,10-9=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

2、,。,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3,11 6 =,12 6 =,13 6 =,14 6 =,15 6 =,你發(fā)現(xiàn)了什么？,5,6,7,8,9,11 6 = 5 12 6 = 6 13 6 = 7 14 6 = 8 15 6 = 9,。,十幾減6，是幾加4,破十法兒歌,退位減，我會(huì)算 十幾減9，是幾加1， 十幾減8，是幾加2， 十幾減7，是幾加3， 十幾

3、減6，是幾加4， 十幾減5，是幾加5.,11 8 =,13 7 =,13 6 =,18 9 =,15 8 =,17 9 =,11 7 =,14 6 =,3,6,7,9,7,8,4,8,15 9 =,12 7 =,13 9 =,15 7 =,11 6 =,16 9 =,17 8 =,14 8 =,6,5,4,8,5,7,9,6,15 9 = 6 16 8 = 8 14 7 = 7 14 6 = 8,18 6 = 12 17 4 = 13 16 4 = 12 15 1 = 14,個(gè)位能夠減,不用退位減,個(gè)位不夠減,要用退位減,9,5,8,2,6,15 6 13 8 14 7 17 9 11 9 1

4、2 6,7,送信,加油！加油！,2,5,8,11,3,9,4,6,10,7,書(shū)本P15.2,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！,書(shū)本P15.3,7,12,15,7,9,2,6,14,14,18,4,13,書(shū)本P16.7,5,8,9,換獎(jiǎng)品,