四年级下册 运算律（笔算）
姓名：_______________
学号：_______________
用时：_______________
| 2 + 37 + 43 = (2 + __) + 43 | 28 + 45 = 45 + __ |
| 63 + 79 = 79 + __ | 44 + 30 = 30 + __ |
| (17 + 8) × 8 = 136 + __ | 95 × 7 = (100 - __) × 7 |
| 55 + 81 = 81 + __ | 89 × 8 = 8 × __ |
| (1 + 20) × 4 = 4 + __ | 18 + 28 + 14 = (18 + __) + 14 |
| 96 × 6 = 100 × 6 - __ × 6 | 12 × 4 = 4 × __ |
| 15 + 27 + 9 = (15 + __) + 9 | 18 + 4 + 45 = (18 + __) + 45 |
| 64 + 38 = 38 + __ | 99 × 5 = (100 - __) × 5 |
| 54 + 77 = 77 + __ | 26 × 2 = 2 × __ |
| 59 + 20 = 20 + __ | 55 × 6 = 6 × __ |
| 97 × 2 = 100 × 2 - __ × 2 | 63 × 9 = 9 × __ |
| 3 × 3 = 3 × __ | 11 × 8 = 8 × __ |
| (8 + 7) × 3 = 24 + __ | 95 × 3 = 100 × 3 - __ × 3 |
| 95 × 8 = (100 - __) × 8 | 12 + 12 + 38 = (12 + __) + 38 |
| 51 + 16 = 16 + __ | 33 + 4 + 28 = (33 + __) + 28 |
| 45 + 49 + 26 = (45 + __) + 26 | (8 + 2) × 7 = 56 + __ |
| (4 + 19) × 9 = 36 + __ | (9 + 20) × 4 = 36 + __ |
| 35 + 7 + 39 = (35 + __) + 39 | 97 × 9 = 100 × 9 - __ × 9 |
四年级下册 运算律（笔算）（答案）
姓名：_______________
学号：_______________
用时：_______________
| 2 + 37 + 43 = (2 + __) + 43 37 | 28 + 45 = 45 + __ 28 |
| 63 + 79 = 79 + __ 63 | 44 + 30 = 30 + __ 44 |
| (17 + 8) × 8 = 136 + __ 64 | 95 × 7 = (100 - __) × 7 5 |
| 55 + 81 = 81 + __ 55 | 89 × 8 = 8 × __ 89 |
| (1 + 20) × 4 = 4 + __ 80 | 18 + 28 + 14 = (18 + __) + 14 28 |
| 96 × 6 = 100 × 6 - __ × 6 4 | 12 × 4 = 4 × __ 12 |
| 15 + 27 + 9 = (15 + __) + 9 27 | 18 + 4 + 45 = (18 + __) + 45 4 |
| 64 + 38 = 38 + __ 64 | 99 × 5 = (100 - __) × 5 1 |
| 54 + 77 = 77 + __ 54 | 26 × 2 = 2 × __ 26 |
| 59 + 20 = 20 + __ 59 | 55 × 6 = 6 × __ 55 |
| 97 × 2 = 100 × 2 - __ × 2 3 | 63 × 9 = 9 × __ 63 |
| 3 × 3 = 3 × __ 3 | 11 × 8 = 8 × __ 11 |
| (8 + 7) × 3 = 24 + __ 21 | 95 × 3 = 100 × 3 - __ × 3 5 |
| 95 × 8 = (100 - __) × 8 5 | 12 + 12 + 38 = (12 + __) + 38 12 |
| 51 + 16 = 16 + __ 51 | 33 + 4 + 28 = (33 + __) + 28 4 |
| 45 + 49 + 26 = (45 + __) + 26 49 | (8 + 2) × 7 = 56 + __ 14 |
| (4 + 19) × 9 = 36 + __ 171 | (9 + 20) × 4 = 36 + __ 80 |
| 35 + 7 + 39 = (35 + __) + 39 7 | 97 × 9 = 100 × 9 - __ × 9 3 |