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小学一年级数学--凑十法练****题
一、凑十法：
(1)、凑十法是20以内进位加法的根本思路。
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 6 = 7 + 5 = 7 + 4 =
6 + 6 = 6 + 5 =
(5)、练
9 + 9 = 8 + 9 = 7+ 9 =
6 + 9 = 5 + 9 = 4 + 9 =
.
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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
5 + 6= 6 + 5=
6 + 9=
.
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(7)、
8 + 6= 9 + 5= 7 + 9=
.5 + 6= 4 + 7= 7 + 8=
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15 - 6 = 14 - 5 = 13 - 4 =
12 - 3 = 11 - 2 = 16 - 7 =
.
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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 =
.
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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 =
.
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9 + 2 = 8 + 7 = 8 + 6 =
8 + 5= 8 + 4 = 8 + 3 =
7 + 6= 7 + 5 = 7 + 4 =
6 + 5 =
〔8〕、练****题八
8
+9
=
7
+9=
6+9=
5
+
9
=
4+
9
=
3+9=
2
+
9
=
7+
8
=
6+8=
.
精品文档
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
=
.
精品文档
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 =
.
精品文档
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=