四年级下册 运算律（笔算）
姓名：_______________
学号：_______________
用时：_______________
| 21 + 16 + 29 = (21 + __) + 29 | 66 + 84 = 84 + __ |
| 93 × 2 = 2 × __ | (5 + 7) × 9 = 45 + __ |
| (9 + 6) × 2 = 18 + __ | (10 + 7) × 8 = 80 + __ |
| (10 + 10) × 8 = 80 + __ | 28 × 9 = 9 × __ |
| 31 + 25 = 25 + __ | (12 + 13) × 8 = 96 + __ |
| 17 + 4 + 43 = (17 + __) + 43 | 69 × 7 = 7 × __ |
| 86 + 78 = 78 + __ | 98 × 3 = 100 × 3 - __ × 3 |
| 96 × 2 = 100 × 2 - __ × 2 | 97 × 2 = (100 - __) × 2 |
| 45 × 6 = 6 × __ | 99 × 5 = (100 - __) × 5 |
| 97 × 2 = 100 × 2 - __ × 2 | (18 + 3) × 5 = 90 + __ |
| 20 + 46 = 46 + __ | 88 × 2 = 2 × __ |
| 85 + 75 = 75 + __ | 69 + 81 = 81 + __ |
| 32 + 40 + 45 = (32 + __) + 45 | 47 × 9 = 9 × __ |
| 98 × 3 = 3 × __ | (11 + 7) × 4 = 44 + __ |
| 15 + 9 + 7 = (15 + __) + 7 | 98 × 3 = (100 - __) × 3 |
| 41 + 11 + 20 = (41 + __) + 20 | 11 + 42 + 44 = (11 + __) + 44 |
| 53 + 12 = 12 + __ | (8 + 13) × 5 = 40 + __ |
| 55 × 6 = 6 × __ | 97 × 9 = 100 × 9 - __ × 9 |
四年级下册 运算律（笔算）（答案）
姓名：_______________
学号：_______________
用时：_______________
| 21 + 16 + 29 = (21 + __) + 29 16 | 66 + 84 = 84 + __ 66 |
| 93 × 2 = 2 × __ 93 | (5 + 7) × 9 = 45 + __ 63 |
| (9 + 6) × 2 = 18 + __ 12 | (10 + 7) × 8 = 80 + __ 56 |
| (10 + 10) × 8 = 80 + __ 80 | 28 × 9 = 9 × __ 28 |
| 31 + 25 = 25 + __ 31 | (12 + 13) × 8 = 96 + __ 104 |
| 17 + 4 + 43 = (17 + __) + 43 4 | 69 × 7 = 7 × __ 69 |
| 86 + 78 = 78 + __ 86 | 98 × 3 = 100 × 3 - __ × 3 2 |
| 96 × 2 = 100 × 2 - __ × 2 4 | 97 × 2 = (100 - __) × 2 3 |
| 45 × 6 = 6 × __ 45 | 99 × 5 = (100 - __) × 5 1 |
| 97 × 2 = 100 × 2 - __ × 2 3 | (18 + 3) × 5 = 90 + __ 15 |
| 20 + 46 = 46 + __ 20 | 88 × 2 = 2 × __ 88 |
| 85 + 75 = 75 + __ 85 | 69 + 81 = 81 + __ 69 |
| 32 + 40 + 45 = (32 + __) + 45 40 | 47 × 9 = 9 × __ 47 |
| 98 × 3 = 3 × __ 98 | (11 + 7) × 4 = 44 + __ 28 |
| 15 + 9 + 7 = (15 + __) + 7 9 | 98 × 3 = (100 - __) × 3 2 |
| 41 + 11 + 20 = (41 + __) + 20 11 | 11 + 42 + 44 = (11 + __) + 44 42 |
| 53 + 12 = 12 + __ 53 | (8 + 13) × 5 = 40 + __ 65 |
| 55 × 6 = 6 × __ 55 | 97 × 9 = 100 × 9 - __ × 9 3 |