《十几减9、8、7、6退位减法.ppt》由会员分享，可在线阅读，更多相关《十几减9、8、7、6退位减法.ppt（21页珍藏版）》请在三一文库上搜索。
1、20 以 内 的 退 位 减 法 -十 几 减 9、8、7、6,刘媛,9+5= 8+3= 7+6= 9+8= 6+5= 9+6=,11,13,17,11,15,口算,14,9+（ ）=11 9+（ ）=14 8+（ ）=12 8+（ ）=15 7+（ ）=13 6+（ ）=11,5,4,7,6,5,填空,2,还剩多少个？,摆一摆,算一算 15-8=,7,说一说,算一算 13-7= 11-6=,6,5,167,8,3,7,5,2,4,6,159,139,179,127,118,119,136,9,11-9=,16-7=,11-6=,2,9,5,15-8=,7,14-9=,5,13-8=,5,12
2、-6=,6,17-9=,8,11 9 =,12 9 =,13 9 =,14 9 =,15 9 =,16 9 =,17 9 =,18 9 =,你发现了什么？,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,。,11 8 =,12 8 =,13 8 =,14 8 =,15 8 =,16 8 =,17 8 =,你发现了什么？,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,。,11 7
3、=,12 7 =,13 7 =,14 7 =,15 7 =,16 7 =,你发现了什么？,4,5,6,7,8,9,11 7 = 4 12 7 = 5 13 7 = 6 14 7 = 7 15 7 = 8 16 7 = 9,。,11 6 =,12 6 =,13 6 =,14 6 =,15 6 =,你发现了什么？,5,6,7,8,9,11 6 = 5 12 6 = 6 13 6 = 7 14 6 = 8 15 6 = 9,。,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 =,6,5,4,8,5,7,9,6,9,5,8,2,6,15 6 13 8 14 7 17 9 11 9 12 6,7,送信,11-（ ）=5 12-（ ）=5 13-（ ）=4 12-（ ）=4 18-（ ）=9 15-（ ）=7,7,9,8,9,8,填空,6,你收获了什么？,谢谢,