四年级下册 运算律（笔算）
姓名：_______________
学号：_______________
用时：_______________
| 99 × 3 = 100 × 3 - __ × 3 | 1 + 45 + 30 = (1 + __) + 30 |
| 97 × 2 = 100 × 2 - __ × 2 | 68 × 8 = 8 × __ |
| 5 + 1 + 28 = (5 + __) + 28 | 17 + 39 + 41 = (17 + __) + 41 |
| 98 × 7 = (100 - __) × 7 | 98 × 9 = (100 - __) × 9 |
| (12 + 12) × 8 = 96 + __ | (16 + 5) × 8 = 128 + __ |
| (15 + 8) × 2 = 30 + __ | (18 + 8) × 8 = 144 + __ |
| (7 + 3) × 3 = 21 + __ | 21 × 2 = 2 × __ |
| 39 × 4 = 4 × __ | 53 + 86 = 86 + __ |
| 99 × 3 = (100 - __) × 3 | 31 × 9 = 9 × __ |
| 71 × 6 = 6 × __ | 43 + 94 = 94 + __ |
| 32 × 6 = 6 × __ | 12 + 28 + 48 = (12 + __) + 48 |
| 16 + 61 = 61 + __ | 50 + 35 + 22 = (50 + __) + 22 |
| 85 + 57 = 57 + __ | 99 × 8 = 100 × 8 - __ × 8 |
| 42 + 36 + 34 = (42 + __) + 34 | 34 + 34 + 40 = (34 + __) + 40 |
| 97 × 9 = 100 × 9 - __ × 9 | 31 × 9 = 9 × __ |
| 98 × 2 = 100 × 2 - __ × 2 | 48 + 23 + 30 = (48 + __) + 30 |
| 98 × 7 = 100 × 7 - __ × 7 | 86 + 70 = 70 + __ |
| 62 × 5 = 5 × __ | 73 + 50 = 50 + __ |
四年级下册 运算律（笔算）（答案）
姓名：_______________
学号：_______________
用时：_______________
| 99 × 3 = 100 × 3 - __ × 3 1 | 1 + 45 + 30 = (1 + __) + 30 45 |
| 97 × 2 = 100 × 2 - __ × 2 3 | 68 × 8 = 8 × __ 68 |
| 5 + 1 + 28 = (5 + __) + 28 1 | 17 + 39 + 41 = (17 + __) + 41 39 |
| 98 × 7 = (100 - __) × 7 2 | 98 × 9 = (100 - __) × 9 2 |
| (12 + 12) × 8 = 96 + __ 96 | (16 + 5) × 8 = 128 + __ 40 |
| (15 + 8) × 2 = 30 + __ 16 | (18 + 8) × 8 = 144 + __ 64 |
| (7 + 3) × 3 = 21 + __ 9 | 21 × 2 = 2 × __ 21 |
| 39 × 4 = 4 × __ 39 | 53 + 86 = 86 + __ 53 |
| 99 × 3 = (100 - __) × 3 1 | 31 × 9 = 9 × __ 31 |
| 71 × 6 = 6 × __ 71 | 43 + 94 = 94 + __ 43 |
| 32 × 6 = 6 × __ 32 | 12 + 28 + 48 = (12 + __) + 48 28 |
| 16 + 61 = 61 + __ 16 | 50 + 35 + 22 = (50 + __) + 22 35 |
| 85 + 57 = 57 + __ 85 | 99 × 8 = 100 × 8 - __ × 8 1 |
| 42 + 36 + 34 = (42 + __) + 34 36 | 34 + 34 + 40 = (34 + __) + 40 34 |
| 97 × 9 = 100 × 9 - __ × 9 3 | 31 × 9 = 9 × __ 31 |
| 98 × 2 = 100 × 2 - __ × 2 2 | 48 + 23 + 30 = (48 + __) + 30 23 |
| 98 × 7 = 100 × 7 - __ × 7 2 | 86 + 70 = 70 + __ 86 |
| 62 × 5 = 5 × __ 62 | 73 + 50 = 50 + __ 73 |