四年级下册 运算律（笔算）
姓名：_______________
学号：_______________
用时：_______________
| 4 × 5 = 5 × __ | 64 × 8 = 8 × __ |
| (19 + 17) × 4 = 76 + __ | (7 + 14) × 5 = 35 + __ |
| 95 × 5 = 100 × 5 - __ × 5 | 96 × 4 = 100 × 4 - __ × 4 |
| 81 + 79 = 79 + __ | (18 + 6) × 8 = 144 + __ |
| 14 + 26 + 22 = (14 + __) + 22 | 24 + 21 + 25 = (24 + __) + 25 |
| 77 + 29 = 29 + __ | 76 × 4 = 4 × __ |
| (10 + 5) × 7 = 70 + __ | 21 × 6 = 6 × __ |
| 99 × 2 = (100 - __) × 2 | 82 + 80 = 80 + __ |
| (2 + 17) × 7 = 14 + __ | (3 + 20) × 7 = 21 + __ |
| 40 × 2 = 2 × __ | (15 + 5) × 5 = 75 + __ |
| 37 + 20 + 45 = (37 + __) + 45 | 45 + 33 + 8 = (45 + __) + 8 |
| 97 × 2 = (100 - __) × 2 | 6 × 9 = 9 × __ |
| 20 + 28 + 8 = (20 + __) + 8 | 40 × 5 = 5 × __ |
| 98 × 9 = 100 × 9 - __ × 9 | 86 + 42 = 42 + __ |
| 18 + 49 = 49 + __ | 56 + 50 = 50 + __ |
| (15 + 12) × 7 = 105 + __ | 52 × 9 = 9 × __ |
| 97 × 2 = 100 × 2 - __ × 2 | 53 × 4 = 4 × __ |
| 95 × 3 = (100 - __) × 3 | (7 + 18) × 6 = 42 + __ |
四年级下册 运算律（笔算）（答案）
姓名：_______________
学号：_______________
用时：_______________
| 4 × 5 = 5 × __ 4 | 64 × 8 = 8 × __ 64 |
| (19 + 17) × 4 = 76 + __ 68 | (7 + 14) × 5 = 35 + __ 70 |
| 95 × 5 = 100 × 5 - __ × 5 5 | 96 × 4 = 100 × 4 - __ × 4 4 |
| 81 + 79 = 79 + __ 81 | (18 + 6) × 8 = 144 + __ 48 |
| 14 + 26 + 22 = (14 + __) + 22 26 | 24 + 21 + 25 = (24 + __) + 25 21 |
| 77 + 29 = 29 + __ 77 | 76 × 4 = 4 × __ 76 |
| (10 + 5) × 7 = 70 + __ 35 | 21 × 6 = 6 × __ 21 |
| 99 × 2 = (100 - __) × 2 1 | 82 + 80 = 80 + __ 82 |
| (2 + 17) × 7 = 14 + __ 119 | (3 + 20) × 7 = 21 + __ 140 |
| 40 × 2 = 2 × __ 40 | (15 + 5) × 5 = 75 + __ 25 |
| 37 + 20 + 45 = (37 + __) + 45 20 | 45 + 33 + 8 = (45 + __) + 8 33 |
| 97 × 2 = (100 - __) × 2 3 | 6 × 9 = 9 × __ 6 |
| 20 + 28 + 8 = (20 + __) + 8 28 | 40 × 5 = 5 × __ 40 |
| 98 × 9 = 100 × 9 - __ × 9 2 | 86 + 42 = 42 + __ 86 |
| 18 + 49 = 49 + __ 18 | 56 + 50 = 50 + __ 56 |
| (15 + 12) × 7 = 105 + __ 84 | 52 × 9 = 9 × __ 52 |
| 97 × 2 = 100 × 2 - __ × 2 3 | 53 × 4 = 4 × __ 53 |
| 95 × 3 = (100 - __) × 3 5 | (7 + 18) × 6 = 42 + __ 108 |