四年级下册 运算律（笔算）
姓名：_______________
学号：_______________
用时：_______________
| (7 + 4) × 5 = 35 + __ | 15 + 31 + 3 = (15 + __) + 3 |
| 49 × 7 = 7 × __ | 25 + 72 = 72 + __ |
| (10 + 13) × 5 = 50 + __ | 19 + 14 + 29 = (19 + __) + 29 |
| 69 × 5 = 5 × __ | (9 + 1) × 4 = 36 + __ |
| 88 + 65 = 65 + __ | 66 × 3 = 3 × __ |
| 98 × 9 = (100 - __) × 9 | 18 + 18 + 32 = (18 + __) + 32 |
| 97 × 5 = (100 - __) × 5 | 15 × 6 = 6 × __ |
| 98 × 3 = (100 - __) × 3 | 96 × 6 = (100 - __) × 6 |
| 99 × 9 = 100 × 9 - __ × 9 | 38 + 28 = 28 + __ |
| 45 + 45 + 49 = (45 + __) + 49 | 96 × 9 = 100 × 9 - __ × 9 |
| 48 + 67 = 67 + __ | (9 + 5) × 7 = 63 + __ |
| (10 + 18) × 7 = 70 + __ | 65 + 11 = 11 + __ |
| 77 + 17 = 17 + __ | 20 + 27 + 37 = (20 + __) + 37 |
| 53 × 9 = 9 × __ | 17 + 10 + 29 = (17 + __) + 29 |
| 12 × 2 = 2 × __ | 5 × 5 = 5 × __ |
| 54 × 3 = 3 × __ | (13 + 10) × 5 = 65 + __ |
| 99 × 7 = (100 - __) × 7 | 38 + 93 = 93 + __ |
| (9 + 11) × 8 = 72 + __ | 96 × 8 = (100 - __) × 8 |
四年级下册 运算律（笔算）（答案）
姓名：_______________
学号：_______________
用时：_______________
| (7 + 4) × 5 = 35 + __ 20 | 15 + 31 + 3 = (15 + __) + 3 31 |
| 49 × 7 = 7 × __ 49 | 25 + 72 = 72 + __ 25 |
| (10 + 13) × 5 = 50 + __ 65 | 19 + 14 + 29 = (19 + __) + 29 14 |
| 69 × 5 = 5 × __ 69 | (9 + 1) × 4 = 36 + __ 4 |
| 88 + 65 = 65 + __ 88 | 66 × 3 = 3 × __ 66 |
| 98 × 9 = (100 - __) × 9 2 | 18 + 18 + 32 = (18 + __) + 32 18 |
| 97 × 5 = (100 - __) × 5 3 | 15 × 6 = 6 × __ 15 |
| 98 × 3 = (100 - __) × 3 2 | 96 × 6 = (100 - __) × 6 4 |
| 99 × 9 = 100 × 9 - __ × 9 1 | 38 + 28 = 28 + __ 38 |
| 45 + 45 + 49 = (45 + __) + 49 45 | 96 × 9 = 100 × 9 - __ × 9 4 |
| 48 + 67 = 67 + __ 48 | (9 + 5) × 7 = 63 + __ 35 |
| (10 + 18) × 7 = 70 + __ 126 | 65 + 11 = 11 + __ 65 |
| 77 + 17 = 17 + __ 77 | 20 + 27 + 37 = (20 + __) + 37 27 |
| 53 × 9 = 9 × __ 53 | 17 + 10 + 29 = (17 + __) + 29 10 |
| 12 × 2 = 2 × __ 12 | 5 × 5 = 5 × __ 5 |
| 54 × 3 = 3 × __ 54 | (13 + 10) × 5 = 65 + __ 50 |
| 99 × 7 = (100 - __) × 7 1 | 38 + 93 = 93 + __ 38 |
| (9 + 11) × 8 = 72 + __ 88 | 96 × 8 = (100 - __) × 8 4 |