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1、十几减8、7、6练习,15 9 = 616 8 = 814 7 = 714 6 = 8,18 6 = 12 17 4 = 1316 4 = 12 15 1 = 14,个位能够减,不用退位减,个位不够减,要用退位减,11 9 =,12 9 =,13 9 =,14 9 =,15 9 =,16 9 =,17 9 =,18 9 =,你发现了什么？,2,3,4,5,6,7,8,9,十几减9，是几加1,11 8 =,12 8 =,13 8 =,14 8 =,15 8 =,16 8 =,17 8 =,你发现了什么？,3,4,5,6,7,8,9,十几减8，是几加2,11 7 =,12 7 =,13 7 =,1
2、4 7 =,15 7 =,16 7 =,你发现了什么？,4,5,6,7,8,9,十几减7，是几加3,11 6 =,12 6 =,13 6 =,14 6 =,15 6 =,你发现了什么？,5,6,7,8,9,十几减6，是几加4,11 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,退位减，我会算：十几减8，几加2， 十几减7，几加3， 十几减6，几加4，,十几减9，
3、几加1，,5支,8支,7支,小明和小红有同样多的苹果，小明吃了2个，小红吃了3个，（ ）剩下的多。,思考题？,小明,基本练习,1. 圈一圈，算一算。,绿色圃中小学教育网http:/,8,7,基本练习,2. 算一算。,绿色圃中小学教育网http:/,绿色圃中小学教育网http:/,13,5,14,11,6,3,绿色圃中小学教育网http:/,3.用你喜欢的方法计算。,10-8= 13-8= 16-8= 11-8= 14-8= 17-8= 12-8= 15-8= 18-8=,基本练习,2,3,4,7,6,5,8,9,10,提高练习,移动 ，从卡片上的数里减去它。,绿色圃中小学教育网http:/,10-8=2,15-8=7,9-8=1,18-8=10,11-8=3,17-8=9,16-8=8,13-8=5,14-8=6,12-8=4,加油！加油！,2,5,8,1,3,9,4,6,10,7,书本P15.2,5,7,8,4,3,6,9,2,5,7,9,6,4,8,5,9,8,10,7,绿色圃中小学教育网http:/,口算：,5,3,7,8,7,9,12,9,8,17,5,6,一个数加上7，它的得数比15小比11大，请问这个数是几？,我最聪明,
