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1、20以内的退位减法,十几减9、8巩固练习,夺宝奇兵,第2关,第3关,第1关,终点,13 9=,13 9=,1,4,第一关：动手小天才,15 8=,15 8=,2,7,11 9=,1,2,2,16 9=,1,7,7,119=,159=,199=,169=,2+9=,6+9=,179=,49=,189=,148=,95=,168=,抢答,9+6=,8+7=,15-8=,15,15,7,18-9=,9,8+4=,12,9+9=,18,15-9=,6,12-8=,4,点蜡烛,跳木桩,15-8,14-9,11-8,13-8,18-9,12-8,139,8,3,7,5,2,4,6,159,149,189,
2、179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,
3、2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,179,129,119,169,139,189,13-9,14-9,15-9,胜利,19-9,17-9,12-9,11-9,18-9,20-9,（）-9=5,16-9,入口,11 9=212 9=313 9=414 9=515 9=616 9=717 9=818 9=9,仔细观察，你发现了什么？,11 9=2,12 9=3,13 9=4,14 9=5,15 9=6,16 9=7,17 9=8,18 9=9,十几减9几加1,19 9=10,再 见,
