四年级下册 运算律（笔算）
姓名：_______________
学号：_______________
用时：_______________
| 10 + 13 + 7 = (10 + __) + 7 | (1 + 5) × 4 = 4 + __ |
| 21 + 41 = 41 + __ | (16 + 8) × 9 = 144 + __ |
| (5 + 13) × 2 = 10 + __ | 36 + 53 = 53 + __ |
| 99 × 4 = (100 - __) × 4 | 97 × 2 = 100 × 2 - __ × 2 |
| 35 + 54 = 54 + __ | 27 × 7 = 7 × __ |
| (11 + 10) × 9 = 99 + __ | 43 + 21 = 21 + __ |
| 43 + 48 + 31 = (43 + __) + 31 | (19 + 15) × 7 = 133 + __ |
| (6 + 19) × 4 = 24 + __ | 78 + 55 = 55 + __ |
| 36 + 14 + 30 = (36 + __) + 30 | 25 + 21 = 21 + __ |
| 89 + 50 = 50 + __ | 83 × 2 = 2 × __ |
| 40 + 99 = 99 + __ | 30 × 7 = 7 × __ |
| 60 × 2 = 2 × __ | 97 × 3 = (100 - __) × 3 |
| 96 × 8 = (100 - __) × 8 | 59 × 5 = 5 × __ |
| 13 + 49 + 48 = (13 + __) + 48 | 36 + 24 = 24 + __ |
| 97 × 2 = (100 - __) × 2 | 40 + 20 + 3 = (40 + __) + 3 |
| (3 + 11) × 9 = 27 + __ | 24 × 4 = 4 × __ |
| 40 + 67 = 67 + __ | 8 + 28 + 17 = (8 + __) + 17 |
| 86 × 7 = 7 × __ | 96 × 6 = 100 × 6 - __ × 6 |
四年级下册 运算律（笔算）（答案）
姓名：_______________
学号：_______________
用时：_______________
| 10 + 13 + 7 = (10 + __) + 7 13 | (1 + 5) × 4 = 4 + __ 20 |
| 21 + 41 = 41 + __ 21 | (16 + 8) × 9 = 144 + __ 72 |
| (5 + 13) × 2 = 10 + __ 26 | 36 + 53 = 53 + __ 36 |
| 99 × 4 = (100 - __) × 4 1 | 97 × 2 = 100 × 2 - __ × 2 3 |
| 35 + 54 = 54 + __ 35 | 27 × 7 = 7 × __ 27 |
| (11 + 10) × 9 = 99 + __ 90 | 43 + 21 = 21 + __ 43 |
| 43 + 48 + 31 = (43 + __) + 31 48 | (19 + 15) × 7 = 133 + __ 105 |
| (6 + 19) × 4 = 24 + __ 76 | 78 + 55 = 55 + __ 78 |
| 36 + 14 + 30 = (36 + __) + 30 14 | 25 + 21 = 21 + __ 25 |
| 89 + 50 = 50 + __ 89 | 83 × 2 = 2 × __ 83 |
| 40 + 99 = 99 + __ 40 | 30 × 7 = 7 × __ 30 |
| 60 × 2 = 2 × __ 60 | 97 × 3 = (100 - __) × 3 3 |
| 96 × 8 = (100 - __) × 8 4 | 59 × 5 = 5 × __ 59 |
| 13 + 49 + 48 = (13 + __) + 48 49 | 36 + 24 = 24 + __ 36 |
| 97 × 2 = (100 - __) × 2 3 | 40 + 20 + 3 = (40 + __) + 3 20 |
| (3 + 11) × 9 = 27 + __ 99 | 24 × 4 = 4 × __ 24 |
| 40 + 67 = 67 + __ 40 | 8 + 28 + 17 = (8 + __) + 17 28 |
| 86 × 7 = 7 × __ 86 | 96 × 6 = 100 × 6 - __ × 6 4 |