四年级下册 运算律（笔算）
姓名：_______________
学号：_______________
用时：_______________
| 48 + 50 + 41 = (48 + __) + 41 | 35 + 19 + 14 = (35 + __) + 14 |
| 80 + 42 = 42 + __ | 46 × 9 = 9 × __ |
| 97 × 7 = 100 × 7 - __ × 7 | 41 + 20 + 49 = (41 + __) + 49 |
| 97 × 3 = (100 - __) × 3 | 95 × 7 = (100 - __) × 7 |
| 98 × 6 = 100 × 6 - __ × 6 | 18 × 8 = 8 × __ |
| 42 + 17 = 17 + __ | 79 + 10 = 10 + __ |
| 1 + 8 + 49 = (1 + __) + 49 | 99 × 8 = 100 × 8 - __ × 8 |
| 22 × 8 = 8 × __ | 90 × 3 = 3 × __ |
| (14 + 6) × 7 = 98 + __ | (11 + 3) × 3 = 33 + __ |
| 29 + 31 + 27 = (29 + __) + 27 | 31 + 5 + 38 = (31 + __) + 38 |
| (16 + 5) × 7 = 112 + __ | 96 × 9 = (100 - __) × 9 |
| 97 × 8 = 100 × 8 - __ × 8 | 93 + 85 = 85 + __ |
| 32 + 18 = 18 + __ | 83 × 8 = 8 × __ |
| 7 + 31 + 4 = (7 + __) + 4 | 98 × 5 = (100 - __) × 5 |
| 40 + 48 + 23 = (40 + __) + 23 | 50 + 52 = 52 + __ |
| (13 + 5) × 2 = 26 + __ | 63 × 2 = 2 × __ |
| 40 × 2 = 2 × __ | 68 + 13 = 13 + __ |
| 95 × 3 = (100 - __) × 3 | 15 × 7 = 7 × __ |
四年级下册 运算律（笔算）（答案）
姓名：_______________
学号：_______________
用时：_______________
| 48 + 50 + 41 = (48 + __) + 41 50 | 35 + 19 + 14 = (35 + __) + 14 19 |
| 80 + 42 = 42 + __ 80 | 46 × 9 = 9 × __ 46 |
| 97 × 7 = 100 × 7 - __ × 7 3 | 41 + 20 + 49 = (41 + __) + 49 20 |
| 97 × 3 = (100 - __) × 3 3 | 95 × 7 = (100 - __) × 7 5 |
| 98 × 6 = 100 × 6 - __ × 6 2 | 18 × 8 = 8 × __ 18 |
| 42 + 17 = 17 + __ 42 | 79 + 10 = 10 + __ 79 |
| 1 + 8 + 49 = (1 + __) + 49 8 | 99 × 8 = 100 × 8 - __ × 8 1 |
| 22 × 8 = 8 × __ 22 | 90 × 3 = 3 × __ 90 |
| (14 + 6) × 7 = 98 + __ 42 | (11 + 3) × 3 = 33 + __ 9 |
| 29 + 31 + 27 = (29 + __) + 27 31 | 31 + 5 + 38 = (31 + __) + 38 5 |
| (16 + 5) × 7 = 112 + __ 35 | 96 × 9 = (100 - __) × 9 4 |
| 97 × 8 = 100 × 8 - __ × 8 3 | 93 + 85 = 85 + __ 93 |
| 32 + 18 = 18 + __ 32 | 83 × 8 = 8 × __ 83 |
| 7 + 31 + 4 = (7 + __) + 4 31 | 98 × 5 = (100 - __) × 5 2 |
| 40 + 48 + 23 = (40 + __) + 23 48 | 50 + 52 = 52 + __ 50 |
| (13 + 5) × 2 = 26 + __ 10 | 63 × 2 = 2 × __ 63 |
| 40 × 2 = 2 × __ 40 | 68 + 13 = 13 + __ 68 |
| 95 × 3 = (100 - __) × 3 5 | 15 × 7 = 7 × __ 15 |