【 练 习 题. 七 】 (凑十法)
8 + 6 = 5 + 6 = 6 + 7 = 9 + 4 = 7 + 6 = 9 + 5 = 4 + 7 = 5 + 6 = 5 + 9 = 5 + 7 = 7 + 9 = 7 + 8 = 5 + 7 = 8 + 7 = 9 + 5 =
【 练 习 题. 八 】 (凑十法)
15 - 6 = 14 - 5 = 13 - 4 =
12 - 3 = 11
17 - 8 = 18
15 - 7 = 17
13 - 5 = 12
16 - 9 = 15
- 2 = - 9 = 16 - 9 = 14 - 4 = 11 - 8 = 14 16 - 7 = - 8 = - 6 = - 3 = - 7 =
13 - 6 = 11 - 4 = 12 - 5 =
15 - 9 = 14
12 - 6 =
13 - 8 = 12
13 - 9 =
12 - 9 = 11
- 8 = 13 11 - 5 = 14 - 7 = 11 - 8 = 11 - 8 = 11 - 7 = - 9 = - 6 = - 7 = - 9 = 12
【 练 习 题. 九 】 (凑十法)
1. 拆小数,凑大数,凑成10,再相加 。
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 =
6 + 5 =
7 + 5 = 7 + 4 =
【 练 习 题. 十 】 (凑十法)
2. 拆大数,凑小数,凑成10,再相加 。
8 + 9 = 7 + 9 = 6 + 9 = 5 + 9 = 4 + 9 = 3 + 9 = 2 + 9 = 7 5 + 8 = 4 + 8 = 3 + 8 = 6 + 7 = 5 + 7 = 4 + 7 = 5 + 6 = 3.
9 + 9 = 8 + 8 = 7 + 7 =
6 + 6 = + 8 = 6 + 8 =