四年级下册 运算律（笔算）
姓名：_______________
学号：_______________
用时：_______________
| 21 + 7 + 16 = (21 + __) + 16 | (5 + 11) × 4 = 20 + __ |
| 99 × 8 = (100 - __) × 8 | 82 + 94 = 94 + __ |
| (8 + 19) × 6 = 48 + __ | 87 + 97 = 97 + __ |
| 99 × 7 = 7 × __ | (9 + 18) × 2 = 18 + __ |
| 10 + 41 + 48 = (10 + __) + 48 | 99 × 4 = (100 - __) × 4 |
| 38 × 6 = 6 × __ | 65 × 3 = 3 × __ |
| 7 × 3 = 3 × __ | 28 × 8 = 8 × __ |
| 36 × 7 = 7 × __ | (14 + 19) × 7 = 98 + __ |
| (7 + 16) × 5 = 35 + __ | 48 + 75 = 75 + __ |
| 95 × 9 = 100 × 9 - __ × 9 | 29 + 32 + 9 = (29 + __) + 9 |
| 37 + 34 + 2 = (37 + __) + 2 | 25 + 27 + 17 = (25 + __) + 17 |
| 19 + 49 = 49 + __ | (3 + 8) × 2 = 6 + __ |
| 88 × 7 = 7 × __ | (14 + 17) × 2 = 28 + __ |
| 99 × 5 = 100 × 5 - __ × 5 | 78 × 4 = 4 × __ |
| (4 + 13) × 5 = 20 + __ | 95 × 6 = (100 - __) × 6 |
| 55 + 96 = 96 + __ | 11 + 6 + 16 = (11 + __) + 16 |
| 27 + 28 + 22 = (27 + __) + 22 | 97 × 2 = (100 - __) × 2 |
| 68 + 85 = 85 + __ | 36 + 20 = 20 + __ |
四年级下册 运算律（笔算）（答案）
姓名：_______________
学号：_______________
用时：_______________
| 21 + 7 + 16 = (21 + __) + 16 7 | (5 + 11) × 4 = 20 + __ 44 |
| 99 × 8 = (100 - __) × 8 1 | 82 + 94 = 94 + __ 82 |
| (8 + 19) × 6 = 48 + __ 114 | 87 + 97 = 97 + __ 87 |
| 99 × 7 = 7 × __ 99 | (9 + 18) × 2 = 18 + __ 36 |
| 10 + 41 + 48 = (10 + __) + 48 41 | 99 × 4 = (100 - __) × 4 1 |
| 38 × 6 = 6 × __ 38 | 65 × 3 = 3 × __ 65 |
| 7 × 3 = 3 × __ 7 | 28 × 8 = 8 × __ 28 |
| 36 × 7 = 7 × __ 36 | (14 + 19) × 7 = 98 + __ 133 |
| (7 + 16) × 5 = 35 + __ 80 | 48 + 75 = 75 + __ 48 |
| 95 × 9 = 100 × 9 - __ × 9 5 | 29 + 32 + 9 = (29 + __) + 9 32 |
| 37 + 34 + 2 = (37 + __) + 2 34 | 25 + 27 + 17 = (25 + __) + 17 27 |
| 19 + 49 = 49 + __ 19 | (3 + 8) × 2 = 6 + __ 16 |
| 88 × 7 = 7 × __ 88 | (14 + 17) × 2 = 28 + __ 34 |
| 99 × 5 = 100 × 5 - __ × 5 1 | 78 × 4 = 4 × __ 78 |
| (4 + 13) × 5 = 20 + __ 65 | 95 × 6 = (100 - __) × 6 5 |
| 55 + 96 = 96 + __ 55 | 11 + 6 + 16 = (11 + __) + 16 6 |
| 27 + 28 + 22 = (27 + __) + 22 28 | 97 × 2 = (100 - __) × 2 3 |
| 68 + 85 = 85 + __ 68 | 36 + 20 = 20 + __ 36 |