资源描述
单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,十几减,8,、,7,、,6,练习,15 9 = 6,16 8 = 8,14 7 = 7,14 6 = 8,18 6 = 12,17 4 = 13,16 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 =,14,7 =,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,，几加,1,，,小明,小华,小军,原有,13,支,17,支,14,支,用去,8,支,9,支,7,支,还剩,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,8,7,基本练习,2.,算一算,。,绿色圃中小学教育网,绿色圃中小学教育网,13,5,14,11,6,3,绿色圃中小学教育网,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。,10,13,16,9,11,17,12,14,18,15,8,绿色圃中小学教育网,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=4,8,加油！加油！,10,13,16,9,11,17,12,14,18,15,-8,2,5,8,1,3,9,4,6,10,7,书本,P15.2,-8,10,15,16,12,11,14,17,13,5,7,8,4,3,6,9,2,-7,14,16,13,11,15,12,5,7,9,6,4,8,-6,11,15,14,16,13,5,9,8,10,7,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,
展开阅读全文