文档详情

小学一年级数学凑十法-破十法-很棒的练习题【教学借鉴】

8**
实名认证
店铺
DOC
1.81MB
约28页
文档ID:156351416
小学一年级数学凑十法-破十法-很棒的练习题【教学借鉴】_第1页
1/28

小学一年级数学--凑十法练习题一、凑十法:(1)、凑十法是20以内进位加法的基本思路运用“凑十法”能够将20以内的进位加法转化为学生所熟悉的10加几的题目,从而化难为简那么“凑十法”在具体计算中是如何“凑”十的呢,我们看以下例题:在计算9+4时,先把4分成1和3,然后9和1凑成10,10再加上3等于13;(2)、凑十歌:1凑9 , 2凑8 , 3凑7来, 4凑6 , 5、5相凑正满10 做减做加想到它,又对又快真方便!(3)、认识凑十法的规律性 不仅可以在解决20以内进位加法的计算中用到,在不进位加法中也可以用到以下边例子说明:如在计算14+5时,先把14分成10和4,然后4和5先加等于9,然后再和前边的10相加等于19; 二、借十法:(1)、借十法 是用在20以内退位减法的计算方法运用借十法可将20以内的退位减法转化为学生所熟悉的10减几的题目,从而化难为简那么“借十法”在具体计算中是如何“凑”十的呢,我们看以下例题:在计算13减4时,先考虑个位3减4,不够减,从十位借10来减,10减4得6,然后用6与个位数3相加等于9; (2)、借十法 口诀 (3)、掌握借十法 凑 十 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。

一加九,十只小蝌蚪, 二加八,十只花老鸭, 三加七,十只老母鸡, 四加六,十只金丝猴, 五加五,十只大老虎 看到9想到1, 看到8想到2, 看到7想到3, 看到6想到4 看到大数加小数, 三、练习题(1)、练 习 题 一 (凑 十 法)9 + 6 = 9 + 5 = 9 + 4 = 9 + 3 = 9 + 2 = 9 + 7 =9 + 8 = 9 + 9 = 8 + 8 =8 + 7 = 8 + 9 = 8 + 6 =8 + 5 = 8 + 4 = 8 + 3 =7 + 9 = 7 + 8 = 7 + 7 =7 + 6 = 7 + 4 = 7 + 5 =6 + 9 = 6 + 8 = 6 + 7 =6 + 6 = 6 + 5 = 5 + 9 = 5 + 8 = 5 + 7 = 5 + 6 =4 + 9 = 4 + 8 = 4 + 7 =3 + 9 = 3 + 8 = 2 + 9 =(2)、练 习 题二 (破十法)18 – 9 = 17 – 9 = 16 – 9 = 15 – 9 = 11 – 4= 14 – 9 = 13 – 9 = 12 – 9 = 11 – 9 = 12 – 3 = 17 – 8 = 16 – 8 = 15 – 8 = 14 – 8 = 11 – 3 = 13 – 8 = 12 – 8 = 11 – 8 = 16 – 7 = 11 – 2 = 15 – 7 = 14 – 7 = 13 – 7 = 12 – 7 = 11 – 5 = 11 – 7 = 15 – 6 = 14 – 6 = 13 – 6 = 12 – 4= 12– 6 = 11 – 6 = 14 – 5 = 13 – 5 = 13 – 4= (3)、 练 习 题. 三 (20以内退位减法)15 - 6 = 12 - 5 = 17 - 9 = 13 - 4 = 11 - 5 = 14 - 7 = 16 - 8 = 15 - 9 = 18 - 9 = 12 - 7 = 14 - 9 = 13 - 7 = 12 - 9 = 11 - 3 = 12 - 4 =16 - 9 = 15 - 8 = 13 - 8 =11 - 6 = 13 - 4 = 14 - 5 =13 - 9 = 17 - 8 = 14 - 6=(4)、练 习 题. 四 (凑十法) 9 + 9 = 9 + 8 = 9 + 7 =9 + 6 = 9 + 5 = 9 + 4 =9 + 3 = 9 + 2 = 8 + 8 =8 + 7 = 8 + 6 = 8 + 5 =8 + 4 = 8 + 3 = 7 + 7 =7 + 6 = 7 + 5 = 7 + 4 =6 + 6 = 6 + 5 = (5)、练 习 题. 五 9 + 9 = 8 + 9 = 7 + 9 =6 + 9 = 5 + 9 = 4 + 9 =3 + 9 = 2 + 9 = 8 + 8 =7 + 8 = 6 + 8 = 5 + 8 =4 + 8 = 3 + 8 = 7 + 7 =6 + 7 = 5 + 7 = 4 + 7 =6 + 6 = 5 + 6 = (6)、练 习 题. 六 9 + 5 =9 + 7 =7 + 4 =8 + 5 =5 + 9 =7 + 7 =5 + 8 =7 + 6 =6 + 8 =7 + 5 =5 + 7 =6 + 6 =6 + 9 =6 + 5 =5 + 6 =(7)、 练 习 题. 七 8 + 6 =9 + 5 =5 + 7 =7 + 6 =8 + 7 =5 + 9 =6 + 7 =5 + 7 =5 + 6 =7 + 8 =4 + 7 =5 + 6 =7 + 9 =9 + 5 =9 + 4 =15 - 6 = 14 - 5 = 13 - 4 =12 - 3 = 11 - 2 = 16 - 7 =17 - 8 = 18 - 9 = 16 - 8 =15 - 7 = 17 - 9 = 14 - 6 =13 - 5 = 12 - 4 = 11 - 3 =16 - 9 = 15 - 8 = 14 - 7 =13 - 6 = 11 - 4 = 12 - 5 =15 - 9 = 14 - 8 = 13 - 7 =12 - 6 = 11 - 5 = 14 - 9 = 13 - 8 = 12 - 7 = 11 - 6 =13 - 9 = 12 - 8 = 11 - 7 =12 - 9 = 11 - 8 = 11 - 9 =9 + 8 = 9 + 7 = 9 + 6 =9 + 5 = 9 + 4 = 9 + 3 =9 + 2 = 8 + 7 = 8 + 6 =8 + 5 = 8 + 4 = 8 + 3 =7 + 6 = 7 + 5 = 7 + 4 =6 + 5 = (8)、 练 习 题八 8 + 9 = 7 + 9 = 6 + 9 =5 + 9 = 4 + 9 = 3 + 9 =2 + 9 = 7 + 8 = 6 + 8 =5 + 8 = 4 + 8 = 3 + 8 =6 + 7 = 5 + 7 = 4 + 7 =5 + 6 = 3.9 + 9 = 8 + 8 = 7 + 7 = 6 + 6 = 9 + 9 = 9 + 8 = 9 + 7 =9 + 6 = 9 + 5 = 9 + 4 =9 + 3 = 9 + 2 = 8 + 8 =8 + 7 = 8 + 6 = 8 + 5 =8 + 4 = 8 + 3 = 7 + 7 =7 + 6 = 7 + 5 = 7 + 4 =6 + 6 = 6 + 5 = 9 + 9 = 8 + 9 = 7 + 9 =6 + 9 = 5 + 9 = 4 + 9 =3 + 9 = 2 + 9 = 8 + 8 =7 + 8 = 6 + 8 = 5 + 8 =4 + 8 = 3 + 8 = 7 + 7 =6 + 7 = 5 + 7 = 4 + 7 =6 + 6 = 5 + 6 = 9 + 6 = 9 + 5 = 9 + 4 = 9 + 3 = 9 + 2 = 9 + 7 = 9 + 8 = 9 + 9 =8 + 8 = 8 + 7 = 8 + 9 = 8 + 6 =8 + 5 = 8 + 4 = 8 + 3 = 7 + 9 =7 + 8 = 7 + 7 = 7 + 6 = 7 + 4 =7 + 5 = 6 + 9 = 6 + 8 = 6 + 7 =6 + 6 = 6 + 5 = 5 + 9 = 5 + 8 = 5 + 7 = 5 + 6 = 4 + 9 = 4 + 8 =4 + 7 = 3 + 9 = 3 + 8 = 2 + 9 = 15 - 6 = 12 - 5 = 17 - 9 = 13 - 4 = 11 - 5 = 14 - 7 = 16 - 8 = 15 - 9 = 18 - 9 = 12 - 7 = 14 - 9 = 13 - 7 = 12 - 9 = 11 - 3 = 12 - 4 = 16 - 9 =15 - 8 = 13 - 8 = 11 - 6 = 13 - 4 = 14 - 5 = 13 - 9 = 17 - 8 = 14 - 6= 14 - 6 =17 - 9 =16 - 8 =11- 8 =12 - 7 =12 - 5 =13- 7 =13 - 8 =14 - 9 =15- 7 =13 - 5 =18 - 9 =11 - 7 =17- 8 =19 - 7 = (9)、练 习 题九 9 + 6 = 9 + 5 = 9 + 4 =9 + 3 = 9 + 2 = 9 + 7 =9 + 8 = 9 + 9 = 8 + 8 =8 + 7 = 8 + 9 = 8 + 6 =8 + 5 = 8 + 4 = 8 + 3 =7 + 9 = 7 + 8 = 7 + 7 =7 + 6 = 7 + 4 = 7 + 5 =6 + 9 = 6 + 8 = 6 + 7 =6 + 6 = 6 + 5 = 5 + 9 = 5 + 8 = 5 + 7 = 5 + 6 =4 + 9 = 4 + 8 = 4 + 7 =3 + 9 = 3 + 8 = 2 + 9 = 9 + 6 = 9 + 5 = 9 + 4 = 9 + 3 =9 + 2 = 9 + 7 = 9 + 8 = 9 + 9 =8 + 8 = 8 + 7 = 8 + 9 = 8 + 6 =15 - 6 = 12 - 5 = 17 - 9 = 13 - 4 = 11 - 5 = 14 - 7 = 16 - 8 = 15 - 9 = 18 - 9 = 12 - 7 = 14 - 9 = 13 - 7 = 12 - 9 = 11 - 3 = 12 - 4 = 16 - 9 =15 - 8 = 13 - 8 = 11 - 6 = 13 - 4 = 14 - 5 = 13 - 9 = 17 - 8 = 14 - 6= 8 + 5 = 8 + 4 = 8 + 3 =7 + 9 = 7 + 8 = 7 + 7 =7 + 6 = 7 + 4 = 7 + 5 =6 + 9 = 6 + 8 = 6 + 7 =6 + 6 = 6 + 5 = 5 + 9 = 15 - 6 = 12 - 5 = 17 - 9 = 13 - 4 = 11 - 5 = 14 - 7 = 16 - 8 = 15 - 9 = 18 - 9 = 12 - 7 = 14 - 9 = 13 - 7 = 12 - 9 = 11 - 3 = 12 - 4 =16 - 9 = 15 - 8 = 13 - 8 =11 - 6 = 13 - 4 = 14 - 5 =13 - 9 = 17 - 8 = 14 - 6= (10)、练 习 题十 20以内退位减法———破十法、凑十法复习例子:9 + 9 = 9 + 8 = 9 + 7 =巩固练习:7 + 9 = 7 + 8 = 7 + 7 =9 + 9 = 9 + 8 = 9 + 7 = 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 = 12– 6 = 11 – 6 = 14 – 5 = 13 – 5 = 6 + 9 = 6 + 8 = 6 + 7 = 3 + 9 = 7 + 8 = 9 + 7 =一、 判断□里的数对不对?对的画“√”,错的画“×”。

13-6=5( ) 15-7=9 ( )  11-2=9( )6+9=15( ) 16+4=20( )  13-9=5( )三、填空1.15比(   )多3     2. (   )比12少53. (   )比20少5    4.17比(   )少35. (   )比19多1    6. (   )比12多4四、看图列式五、应用题1.小雨和小雪共画了15朵花,小雨画了9朵,小雪画了几朵?2.小明有18枝彩色笔,小刚借走了9枝,小明还有几枝?3.同学们排队,小兰的前边有5人,后面有7人,这一行共有多少人?4.同学们排队,小兰的前边有5人,后面有7人,这一行共有多少人?5.停车场上的汽车开走了6辆,又开走了5辆,一共开走了多少辆?28普通教学a。

下载提示
相关文档
正为您匹配相似的精品文档