四年级下册 运算律（笔算）
姓名：_______________
学号：_______________
用时：_______________
| 9 + 39 + 18 = (9 + __) + 18 | 90 × 4 = 4 × __ |
| 95 × 8 = (100 - __) × 8 | (2 + 13) × 9 = 18 + __ |
| 36 + 12 + 40 = (36 + __) + 40 | 55 + 93 = 93 + __ |
| 94 × 8 = 8 × __ | 20 × 7 = 7 × __ |
| 32 + 47 + 43 = (32 + __) + 43 | 51 × 5 = 5 × __ |
| 48 + 49 + 2 = (48 + __) + 2 | 48 + 37 + 7 = (48 + __) + 7 |
| 68 + 14 = 14 + __ | 19 + 16 = 16 + __ |
| 97 × 4 = 100 × 4 - __ × 4 | 40 + 28 + 5 = (40 + __) + 5 |
| 97 × 2 = (100 - __) × 2 | 99 × 8 = 100 × 8 - __ × 8 |
| 15 + 4 + 45 = (15 + __) + 45 | 38 × 8 = 8 × __ |
| 96 × 9 = (100 - __) × 9 | (17 + 10) × 3 = 51 + __ |
| 97 × 8 = 100 × 8 - __ × 8 | 6 + 14 + 21 = (6 + __) + 21 |
| 63 + 33 = 33 + __ | 34 + 45 = 45 + __ |
| (3 + 12) × 2 = 6 + __ | (9 + 13) × 6 = 54 + __ |
| (20 + 6) × 4 = 80 + __ | 58 + 34 = 34 + __ |
| 46 + 46 + 13 = (46 + __) + 13 | (20 + 9) × 6 = 120 + __ |
| 98 × 4 = (100 - __) × 4 | 40 + 58 = 58 + __ |
| 96 × 5 = 5 × __ | 96 × 7 = (100 - __) × 7 |
四年级下册 运算律（笔算）（答案）
姓名：_______________
学号：_______________
用时：_______________
| 9 + 39 + 18 = (9 + __) + 18 39 | 90 × 4 = 4 × __ 90 |
| 95 × 8 = (100 - __) × 8 5 | (2 + 13) × 9 = 18 + __ 117 |
| 36 + 12 + 40 = (36 + __) + 40 12 | 55 + 93 = 93 + __ 55 |
| 94 × 8 = 8 × __ 94 | 20 × 7 = 7 × __ 20 |
| 32 + 47 + 43 = (32 + __) + 43 47 | 51 × 5 = 5 × __ 51 |
| 48 + 49 + 2 = (48 + __) + 2 49 | 48 + 37 + 7 = (48 + __) + 7 37 |
| 68 + 14 = 14 + __ 68 | 19 + 16 = 16 + __ 19 |
| 97 × 4 = 100 × 4 - __ × 4 3 | 40 + 28 + 5 = (40 + __) + 5 28 |
| 97 × 2 = (100 - __) × 2 3 | 99 × 8 = 100 × 8 - __ × 8 1 |
| 15 + 4 + 45 = (15 + __) + 45 4 | 38 × 8 = 8 × __ 38 |
| 96 × 9 = (100 - __) × 9 4 | (17 + 10) × 3 = 51 + __ 30 |
| 97 × 8 = 100 × 8 - __ × 8 3 | 6 + 14 + 21 = (6 + __) + 21 14 |
| 63 + 33 = 33 + __ 63 | 34 + 45 = 45 + __ 34 |
| (3 + 12) × 2 = 6 + __ 24 | (9 + 13) × 6 = 54 + __ 78 |
| (20 + 6) × 4 = 80 + __ 24 | 58 + 34 = 34 + __ 58 |
| 46 + 46 + 13 = (46 + __) + 13 46 | (20 + 9) × 6 = 120 + __ 54 |
| 98 × 4 = (100 - __) × 4 2 | 40 + 58 = 58 + __ 40 |
| 96 × 5 = 5 × __ 96 | 96 × 7 = (100 - __) × 7 4 |