一年级数学20以内破十法减法练习题.doc

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20以内破十法减法练习题凑十法儿歌一九一九好朋友,二八二八手拉手。三七三七真亲密,四六四六一起走,五五凑成一双手。看大数,分小数,凑成十,加剩数。大数记心里,小数记手里18 9 = 17 9 = 16 9 = 15 9 = 14 9 = 13 9 = 12 9 = 11 9 = 17 8 = 16 8 = 15 8 = 14 8 = 13 8 = 12 8 = 11 8 = 16 7 = 15 7 = 14 7 = 13 7 = 12 7 = 11 7 = 15 6 = 14 6 = 13 6 = 12 6 = 11 6 = 14 5 = 13 5 = 12 5 = 11 5 = 13 4 = 12 4 = 11 4 = 12 3 = 11 3 = 11 2 = 13 5 = 12 5 = 11 5 = 13 4 = 12 4 = 11 4 = 16 7 = 15 7 = 14 7 = 18 9 = 17 9 = 16 9 = 15 9 = 14 9 = 13 9 = 13 7 = 12 7 = 11 7 = 12 9 = 11 9 = 17 8 = 16 8 = 15 8 = 14 8 = 13 4 = 12 4 = 11 4 = 12 3 = 11 3 = 11 2 = 13 5 = 12 5 = 11 5 = 13 8 = 12 8 = 11 8 = 16 7 = 15 7 = 14 7 = 12 6 = 11 6 = 14 5 = 15 9 = 14 9 = 13 9 = 13 4 = 12 4 = 11 4 = 12 3 = 11 3 = 11 2 = 13 5 = 12 5 = 11 5 = 13 8 = 12 8 = 11 8 = 16 7 = 15 7 = 14 7 = 12 6 = 11 6 = 14 5 = 15 9 = 14 9 = 13 9 = 13 4 = 12 4 = 11 4 = 16 7 = 15 7 = 14 7 = 18 9 = 17 9 = 16 9 = 15 9 = 14 9 = 13 9 = 13 7 = 12 7 = 11 7 = 12 9 = 11 9 = 17 8 = 16 8 = 15 8 = 14 8 = 13 4 = 12 4 = 11 4 = 16 7 = 15 7 = 14 7 = 18 9 = 17 9 = 16 9 = 15 9 = 14 9 = 13 9 = 13 7 = 12 7 = 11 7 = 12 9 = 11 9 = 17 8 = 16 8 = 15 8 = 14 8 = 13 4 = 12 4 = 11 4 = 12 3 = 11 3 = 11 2 = 13 5 = 12 5 = 11 5 = 13 8 = 12 8 = 11 8 = 16 7 = 15 7 = 14 7 = 12 6 = 11 6 = 14 5 = 15 9 = 14 9 = 13 9 = 13 4 = 12 4 = 11 4 = 12 3 = 11 3 = 11 2 = 13 5 = 12 5 = 11 5 = 13 8 = 12 8 = 11 8 = 16 7 = 15 7 = 14 7 = 12 6 = 11 6 = 14 5 = 15 9 = 14 9 = 13 9 = 13 4 = 12 4 = 11 4 = 16 7 = 15 7 = 14 7 = 18 9 = 17 9 = 16 9 = 15 9 = 14 9 = 13 9 = 13 7 = 12 7 = 11 7 = 12 9 = 11 9 = 17 8 = 16 8 = 15 8 = 14 8 = 13 4 = 12 4 = 11 4 = 16 7 = 15 7 = 14 7 = 18 9 = 17 9 = 16 9 = 15 9 = 14 9 = 13 9 = 13 7 = 12 7 = 11 7 = 12 9 = 11 9 = 17 8 = 16 8 = 15 8 = 14 8 = 13 4 = 12 4 = 11 4 = 12 3 = 11 3 = 11 2 = 13 5 = 12 5 = 11 5 = 13 8 = 12 8 = 11 8 = 16 7 = 15 7 = 14 7 = 12 6 = 11 6 = 14 5 = 15 9 = 14 9 = 13 9 = 13 4 = 12 4 = 11 4 = 12 3 = 11 3 = 11 2 = 13 5 = 12 5 = 11 5 = 13 8 = 12 8 = 11 8 = 16 7 = 15 7 = 14 7 = 12 6 = 11 6 = 14 5 = 15 9 = 14 9 = 13 9 = 13 4 = 12 4 = 11 4 = 16 7 = 15 7 = 14 7 = 18 9 = 17 9 = 16 9 = 15 9 = 14 9 = 13 9 = 13 7 = 12 7 = 11 7 = 12 9 = 11 9 = 17 8 = 16 8 = 15 8 = 14 8 = 例子:9 + 9 = 9 + 8 = 9 + 7 =巩固练习:7 + 9 = 7 + 8 = 7 + 7 =9 + 9 = 9 + 8 = 9 + 7 =【重点知识二】破十法:退位减法使用破十法口诀:看大数,分出10,减小数,加剩数例子:18 9 = 17 9 = 16 9 = 15 9 = 巩固练习:17 8 = 16 8 = 15 8 = 14 8 = 13 8 = 12 8 = 11 8 = 16 7 = 提升练习题一、 口算12 6 = 11 6 = 14 5 = 13 5 = 6 + 9 = 6 + 8 = 6 + 7 =15 6 = 12 6 = 12 5 = 17 9 = 13 4= 11 5 = 14 6 = 16 8= 15 9= 18 9= 12 7= 14 9= 13 7 = 12 9 = 11 3 = 12 5 = 13 7 = 12 9 = 11 3 = 12 5 = 16 9 = 15 8 = 13 8= 11 6 = 13 7 = 12 9 = 11 3 = 12 5 = 20
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