,第 4 课时 12、13 减 几(2),第 六 单元 20以内数的退位减法,13,139,9,4,104=66+3=9,4+9=13 134=9 139=4,109=11+3=4,2,13 6 = 7,13 5 = 8,6,5,13 7 =,13 8 =,试 一 试,对口令。(同桌活动),13 4=9 13 5=8 13 6=7 13 7=6 13 8=5 13 9=4,按规律写出13减几的算式,13 9=4 13 8=5 13 7=6 13 6=7 13 5=8 13 4=9,7,5,7,5,5,7,+,= 12,12,12,=,=,8,5,8,5,5,8,+,= 13,13,13,=,=,看图填空。,开锁(连线),7,6,5,4,7,6,5,夺红旗,4,原来有12件衣服,取走了7件。 还剩多少件衣服?,127 = 5(件),135= (个),8,小兔,兔妈妈,小兔比妈妈少背了多少个?,115,4,7,5,6,139,114,127,125,136,137,138,117,128,126,116,