1、十几减十几减8 8、7 7、6 6练习练习新人教版数学一年级下册新人教版数学一年级下册111 9 = 12 9 = 14 9 = 15 9 = 17 9 = 18 9 = 你发现了什么?23568911012101211 9 = 212 9 = 313 9 = 414 9 = 515 9 = 616 9 = 717 9 = 818 9 = 9十几减十几减9,是几加是几加110-9=1311 8 = 12 8 = 13 8 = 14 8 = 15 8 = 16 8 = 17 8 = 你发现了什么?345678911022102411 8 = 312 8 = 413 8 = 514 8 = 615
2、 8 = 716 8 = 8十几减十几减8,是几加是几加2511 7 = 12 7 = 13 7 = 14 7 = 15 7 = 16 7 = 你发现了什么?45678911032103611 7 = 412 7 = 513 7 = 614 7 = 715 7 = 816 7 = 9十几减十几减7,是几加是几加3711 6 = 12 6 = 13 6 = 14 6 = 15 6 = 你发现了什么?56789811 6 = 512 6 = 613 6 = 714 6 = 815 6 = 9十几减十几减6,是几加是几加49 破十法儿歌破十法儿歌 退位减,我会算退位减,我会算十几减十几减9,是几加,
3、是几加1,十几减十几减8,是几加,是几加2,十几减十几减7,是几加,是几加3,十几减十几减6,是几加,是几加4,十几减十几减5,是几加,是几加5.1011 8 = 13 7 = 13 6 = 18 9 = 15 8 = 17 9 = 11 7 = 14 6 = 3679784815 9 = 12 7 = 13 9 = 15 7 = 11 6 = 16 9 = 17 8 = 14 8 = 654857961115 9 = 616 8 = 814 7 = 714 6 = 8 18 6 = 12 17 4 = 1316 4 = 12 15 1 = 14个位能够减个位能够减,不用退位减不用退位减个位不
4、够减个位不够减,要用退位减要用退位减129582615 6 13 8 14 7 17 9 11 9 12 6 7送信送信13加油!加油!加油!加油!10 13 16 19 11 17 12 14 18 15-825 8 11 3946 107书本书本P15.214书本书本P15.3138=5158=7168=8128=4118=3148=6178=9108=2127=5147=7167=9137=6117=4157=8116=5156=9146=8166=10136=7138=5158=7168=8128=4118=3148=6178=9108=2127=5147=7167=9137=6117=4157=8116=5156=9146=8166=10136=71516书本书本P15.3712157926141418413书本书本P16.7589171819换奖品换奖品儿儿童童时时代代8分换一本分换一本两次得分够换一本吗?两次得分够换一本吗?还多几分?还多几分?次数次数得分得分第一次第一次7第二次第二次66+7=13(分)(分)13-8=5(分)(分)答:两次得分够换一本,还多答:两次得分够换一本,还多5分。分。20