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1、十几减8、7、6的练习,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,。,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？,3,4,5,6,7,8,9,11 8 = 3 12 8 = 4 13 8 = 5 14 8 = 6 15 8 = 7 16 8 = 8
2、,。,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？,4,5,6,7,8,9,11 7 = 4 12 7 = 5 13 7 = 6 14 7 = 7 15 7 = 8 16 7 = 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？,5,6,7,8,9,11 6 = 5 12 6 = 6 13 6 = 7 14 6 = 8 15 6 = 9,。,十几减6，是几加4,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
3、减6，是几加4， 十几减5，是几加5.,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 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,
