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单击此处编辑母版标题样式,编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,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,*,大家好,1,十几减,8,、,7,、,6,练习,新人教版数学一年级下册,2,基础练习,12,7=,11,8=,13,6=,15,7=,18,9=,16,7=,7 + 5=,17,8=,14,6=,8 + 9=,11,6=,15,9=,5,3,7,8,9,9,12,9,8,17,5,7,15,7=8,18,9=9,11,6=5,个位不够减，要用退位减；个位能够减，不用退位减。,3,11,9 =,12,9 =,13,9 =,14,9 =,15,9 =,16,9 =,17,9 =,18,9 =,你发现了什么？,2,3,4,5,6,7,8,9,4,1,1,9,=,2,1,2,9 =,3,1,3,9 =,4,1,4,9 =,5,1,5,9 =,6,1,6,9 =,7,1,7,9 =,8,1,8,9 =,9,。,十几减,9,，是几加,1,5,11,8 =,12,8 =,13,8 =,14,8 =,15,8 =,16,8 =,17,8 =,你发现了什么？,3,4,5,6,7,8,9,6,1,1,8,=,3,1,2,8 =,4,1,3,8 =,5,1,4,8 =,6,1,5,8 =,7,1,6,8 =,8,。,十几减,8,，是几加,2,7,11,7 =,12,7 =,13,7 =,14,7 =,15,7 =,16,7 =,你发现了什么？,4,5,6,7,8,9,8,1,1,7,=,4,1,2,7 =,5,1,3,7 =,6,1,4,7 =,7,1,5,7 =,8,1,6,7 =,9,。,十几减,7,，是几加,3,9,11,8 =,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 =,6,5,4,8,5,7,9,6,10,破十法儿歌,退位减，我会算,十几减,9,，是几加,1,，,十几减,8,，是几加,2,，,十几减,7,，是几加,3,，,十几减,6,，是几加,4,，,十几减,5,，是几加,5.,11,减九想一,11-9,，见减数,9,想,1,1,加上被减数个位上的,1,得,2,，所以,11-9=2,减八想二,11-8,，见减数,8,想,2,2,加上被减数个位上的,1,得,3,，所以,11-8=3,减七想三,11-7,，见减数,7,想,3,3,加上被减数个位上的,1,得,4,，所以,11-7=4,减六想四,11-6,，见减数,6,想,4,4,加上被减数个位上的,1,得,5,，所以,11-6=5,12,书本,P15.3,13,8=5,15,8=7,16,8=8,12,8=4,11,8=3,14,8=6,17,8=9,10,8=2,12,7=5,14,7=7,16,7=9,13,7=6,11,7=4,15,7=8,11,6=5,15,6=9,14,6=8,16,6=10,13,6=7,1,3,8=,5,1,5,8=,7,1,6,8=,8,1,2,8=,4,1,1,8=,3,1,4,8=,6,1,7,8=,9,1,0,8=,2,1,2,7=,5,1,4,7=,7,1,6,7=,9,1,3,7=,6,1,1,7=,4,1,5,7=,8,1,1,6=,5,1,5,6=,9,1,4,6=,8,16,6=10,1,3,6=,7,13,加油！加油！,2,5,8,11,3,9,4,6,10,7,书本,P15.2,14,我会算！,7,12,15,7,9,2,6,14,14,18,4,13,书本,P16.7,5,8,9,11-6=5,15-7=8,18-9=9,15,16,6,12,-,6,6,17,一个数加上,7,，它的得数比,15,小比,11,大，请问这个数是几？,我最聪明,( ) + 7 15,11,12,13,14,( ) + 7 =12,( ) + 7 =13,( ) + 7 =14,6,5,7,18,换奖品,儿童时代,8,分换一本,两次得分够换一本吗？,还多几分？,6+7=13,（分）,13-8=5,（分）,答：两次得分够换一本，还多,5,分。,19,
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