【加法结合律100道题】在小学数学中，加法结合律是一个非常重要的运算定律。它指的是：三个数相加，先把前两个数相加，或者先把后两个数相加，和不变。即：
(a + b) + c = a + (b + c)
为了帮助学生更好地理解和掌握加法结合律，下面整理了100道相关练习题，并附上答案，便于学习和复习。
一、题目与答案汇总表（共100题）
| 题号 | 题目 | 答案 |
| 1 | (3 + 5) + 2 = ? | 10 |
| 2 | 3 + (5 + 2) = ? | 10 |
| 3 | (7 + 4) + 6 = ? | 17 |
| 4 | 7 + (4 + 6) = ? | 17 |
| 5 | (9 + 1) + 8 = ? | 18 |
| 6 | 9 + (1 + 8) = ? | 18 |
| 7 | (2 + 8) + 5 = ? | 15 |
| 8 | 2 + (8 + 5) = ? | 15 |
| 9 | (6 + 3) + 4 = ? | 13 |
| 10 | 6 + (3 + 4) = ? | 13 |
| 11 | (10 + 5) + 3 = ? | 18 |
| 12 | 10 + (5 + 3) = ? | 18 |
| 13 | (4 + 6) + 7 = ? | 17 |
| 14 | 4 + (6 + 7) = ? | 17 |
| 15 | (1 + 9) + 10 = ? | 20 |
| 16 | 1 + (9 + 10) = ? | 20 |
| 17 | (5 + 5) + 5 = ? | 15 |
| 18 | 5 + (5 + 5) = ? | 15 |
| 19 | (8 + 2) + 9 = ? | 19 |
| 20 | 8 + (2 + 9) = ? | 19 |
| 21 | (12 + 3) + 5 = ? | 20 |
| 22 | 12 + (3 + 5) = ? | 20 |
| 23 | (7 + 8) + 4 = ? | 19 |
| 24 | 7 + (8 + 4) = ? | 19 |
| 25 | (11 + 2) + 6 = ? | 19 |
| 26 | 11 + (2 + 6) = ? | 19 |
| 27 | (9 + 7) + 3 = ? | 19 |
| 28 | 9 + (7 + 3) = ? | 19 |
| 29 | (10 + 10) + 5 = ? | 25 |
| 30 | 10 + (10 + 5) = ? | 25 |
| 31 | (6 + 9) + 4 = ? | 19 |
| 32 | 6 + (9 + 4) = ? | 19 |
| 33 | (13 + 2) + 5 = ? | 20 |
| 34 | 13 + (2 + 5) = ? | 20 |
| 35 | (8 + 7) + 5 = ? | 20 |
| 36 | 8 + (7 + 5) = ? | 20 |
| 37 | (14 + 1) + 3 = ? | 18 |
| 38 | 14 + (1 + 3) = ? | 18 |
| 39 | (5 + 10) + 7 = ? | 22 |
| 40 | 5 + (10 + 7) = ? | 22 |
| 41 | (15 + 5) + 10 = ? | 30 |
| 42 | 15 + (5 + 10) = ? | 30 |
| 43 | (12 + 8) + 7 = ? | 27 |
| 44 | 12 + (8 + 7) = ? | 27 |
| 45 | (9 + 6) + 8 = ? | 23 |
| 46 | 9 + (6 + 8) = ? | 23 |
| 47 | (10 + 3) + 12 = ? | 25 |
| 48 | 10 + (3 + 12) = ? | 25 |
| 49 | (7 + 11) + 6 = ? | 24 |
| 50 | 7 + (11 + 6) = ? | 24 |
| 51 | (4 + 15) + 9 = ? | 28 |
| 52 | 4 + (15 + 9) = ? | 28 |
| 53 | (16 + 2) + 8 = ? | 26 |
| 54 | 16 + (2 + 8) = ? | 26 |
| 55 | (17 + 3) + 10 = ? | 30 |
| 56 | 17 + (3 + 10) = ? | 30 |
| 57 | (18 + 1) + 9 = ? | 28 |
| 58 | 18 + (1 + 9) = ? | 28 |
| 59 | (19 + 2) + 7 = ? | 28 |
| 60 | 19 + (2 + 7) = ? | 28 |
| 61 | (11 + 9) + 10 = ? | 30 |
| 62 | 11 + (9 + 10) = ? | 30 |
| 63 | (13 + 7) + 10 = ? | 30 |
| 64 | 13 + (7 + 10) = ? | 30 |
| 65 | (12 + 10) + 8 = ? | 30 |
| 66 | 12 + (10 + 8) = ? | 30 |
| 67 | (14 + 6) + 10 = ? | 30 |
| 68 | 14 + (6 + 10) = ? | 30 |
| 69 | (15 + 5) + 10 = ? | 30 |
| 70 | 15 + (5 + 10) = ? | 30 |
| 71 | (16 + 4) + 10 = ? | 30 |
| 72 | 16 + (4 + 10) = ? | 30 |
| 73 | (17 + 3) + 10 = ? | 30 |
| 74 | 17 + (3 + 10) = ? | 30 |
| 75 | (18 + 2) + 10 = ? | 30 |
| 76 | 18 + (2 + 10) = ? | 30 |
| 77 | (19 + 1) + 10 = ? | 30 |
| 78 | 19 + (1 + 10) = ? | 30 |
| 79 | (20 + 0) + 10 = ? | 30 |
| 80 | 20 + (0 + 10) = ? | 30 |
| 81 | (12 + 7) + 11 = ? | 30 |
| 82 | 12 + (7 + 11) = ? | 30 |
| 83 | (13 + 8) + 9 = ? | 30 |
| 84 | 13 + (8 + 9) = ? | 30 |
| 85 | (14 + 9) + 7 = ? | 30 |
| 86 | 14 + (9 + 7) = ? | 30 |
| 87 | (15 + 10) + 5 = ? | 30 |
| 88 | 15 + (10 + 5) = ? | 30 |
| 89 | (16 + 11) + 3 = ? | 30 |
| 90 | 16 + (11 + 3) = ? | 30 |
| 91 | (17 + 12) + 1 = ? | 30 |
| 92 | 17 + (12 + 1) = ? | 30 |
| 93 | (18 + 11) + 1 = ? | 30 |
| 94 | 18 + (11 + 1) = ? | 30 |
| 95 | (19 + 10) + 1 = ? | 30 |
| 96 | 19 + (10 + 1) = ? | 30 |
| 97 | (20 + 9) + 1 = ? | 30 |
| 98 | 20 + (9 + 1) = ? | 30 |
| 99 | (21 + 8) + 1 = ? | 30 |
| 100 | 21 + (8 + 1) = ? | 30 |
二、总结
通过这100道题目，我们可以看到加法结合律在实际计算中的应用非常广泛。无论是简单的整数加法还是稍复杂的数字组合，只要符合“先加前两数”或“先加后两数”的规则，结果都会保持一致。
建议在做题时注意以下几点：
- 先观察题目结构，判断是否可以运用加法结合律；
- 尝试不同的组合方式，验证结果是否一致；
- 多做练习，提高对运算规律的理解和熟练度。
希望这份练习题能帮助你更好地掌握加法结合律！
以上就是【加法结合律100道题】相关内容，希望对您有所帮助。
