【五年级下计算题80道有答案】在小学数学的学习过程中，计算题是巩固基础知识、提高运算能力的重要方式。为了帮助学生更好地掌握五年级下册的计算技巧，我们整理了80道具有代表性的计算题，并附上详细答案。这些题目涵盖小数加减法、分数运算、简易方程、整数四则运算等内容，适合课后练习和复习。
以下为部分题目的总结及完整答案表格：
一、题目类型概述
1. 小数加减法（20题）
2. 分数加减法（15题）
3. 整数乘除法（15题）
4. 简易方程（10题）
5. 混合运算（20题）
二、部分题目示例
| 题号 | 题目 | 答案 |
| 1 | 3.5 + 2.7 = ? | 6.2 |
| 2 | 8.9 - 4.3 = ? | 4.6 |
| 3 | 1/2 + 1/4 = ? | 3/4 |
| 4 | 3/5 - 1/5 = ? | 2/5 |
| 5 | 12 × 4 = ? | 48 |
| 6 | 63 ÷ 7 = ? | 9 |
| 7 | x + 5 = 12 → x = ? | 7 |
| 8 | 2x = 16 → x = ? | 8 |
| 9 | 3.2 + 1.8 - 2.5 = ? | 2.5 |
| 10 | 1/3 + 2/3 = ? | 1 |
三、完整答案表格（共80题）
以下是全部80题的答案列表，供参考使用：
| 题号 | 题目 | 答案 |
| 1 | 3.5 + 2.7 | 6.2 |
| 2 | 8.9 - 4.3 | 4.6 |
| 3 | 1/2 + 1/4 | 3/4 |
| 4 | 3/5 - 1/5 | 2/5 |
| 5 | 12 × 4 | 48 |
| 6 | 63 ÷ 7 | 9 |
| 7 | x + 5 = 12 | 7 |
| 8 | 2x = 16 | 8 |
| 9 | 3.2 + 1.8 - 2.5 | 2.5 |
| 10 | 1/3 + 2/3 | 1 |
| 11 | 4.8 + 3.2 | 8.0 |
| 12 | 9.7 - 5.4 | 4.3 |
| 13 | 2/3 + 1/6 | 5/6 |
| 14 | 5/8 - 1/8 | 4/8 = 1/2 |
| 15 | 15 × 6 | 90 |
| 16 | 72 ÷ 9 | 8 |
| 17 | x - 3 = 10 | 13 |
| 18 | 5x = 30 | 6 |
| 19 | 2.5 + 3.7 - 1.2 | 5.0 |
| 20 | 3/4 + 1/4 | 1 |
| 21 | 6.4 + 2.6 | 9.0 |
| 22 | 10.5 - 6.3 | 4.2 |
| 23 | 1/2 + 3/4 | 5/4 |
| 24 | 7/9 - 2/9 | 5/9 |
| 25 | 18 × 5 | 90 |
| 26 | 81 ÷ 9 | 9 |
| 27 | x + 8 = 15 | 7 |
| 28 | 4x = 20 | 5 |
| 29 | 4.3 + 2.7 - 3.1 | 3.9 |
| 30 | 2/5 + 3/5 | 1 |
| 31 | 7.6 + 1.4 | 9.0 |
| 32 | 12.9 - 8.5 | 4.4 |
| 33 | 3/4 + 1/8 | 7/8 |
| 34 | 5/6 - 1/6 | 4/6 = 2/3 |
| 35 | 20 × 7 | 140 |
| 36 | 96 ÷ 8 | 12 |
| 37 | x - 4 = 9 | 13 |
| 38 | 3x = 21 | 7 |
| 39 | 5.2 + 3.8 - 2.1 | 6.9 |
| 40 | 1/2 + 1/2 | 1 |
| 41 | 5.7 + 3.3 | 9.0 |
| 42 | 11.2 - 6.8 | 4.4 |
| 43 | 2/3 + 1/6 | 5/6 |
| 44 | 7/10 - 3/10 | 4/10 = 2/5 |
| 45 | 14 × 8 | 112 |
| 46 | 100 ÷ 5 | 20 |
| 47 | x + 6 = 13 | 7 |
| 48 | 6x = 42 | 7 |
| 49 | 6.5 + 2.5 - 3.0 | 6.0 |
| 50 | 3/4 + 1/4 | 1 |
| 51 | 8.2 + 1.8 | 10.0 |
| 52 | 15.6 - 9.4 | 6.2 |
| 53 | 1/3 + 2/3 | 1 |
| 54 | 4/5 - 1/5 | 3/5 |
| 55 | 25 × 4 | 100 |
| 56 | 77 ÷ 7 | 11 |
| 57 | x - 2 = 10 | 12 |
| 58 | 2x = 14 | 7 |
| 59 | 4.6 + 3.4 - 2.0 | 6.0 |
| 60 | 2/3 + 1/3 | 1 |
| 61 | 9.3 + 0.7 | 10.0 |
| 62 | 13.5 - 7.2 | 6.3 |
| 63 | 1/4 + 3/4 | 1 |
| 64 | 5/7 - 2/7 | 3/7 |
| 65 | 16 × 5 | 80 |
| 66 | 90 ÷ 10 | 9 |
| 67 | x + 9 = 16 | 7 |
| 68 | 7x = 56 | 8 |
| 69 | 3.7 + 4.3 - 2.5 | 5.5 |
| 70 | 1/2 + 1/2 | 1 |
| 71 | 6.8 + 2.2 | 9.0 |
| 72 | 14.3 - 8.1 | 6.2 |
| 73 | 2/5 + 3/5 | 1 |
| 74 | 6/8 - 2/8 | 4/8 = 1/2 |
| 75 | 17 × 3 | 51 |
| 76 | 84 ÷ 6 | 14 |
| 77 | x - 5 = 11 | 16 |
| 78 | 5x = 45 | 9 |
| 79 | 5.5 + 3.5 - 4.0 | 5.0 |
| 80 | 3/4 + 1/4 | 1 |
通过这80道计算题的练习，学生可以系统地提升运算能力，强化对小数、分数和方程的理解。建议在做题时注重步骤清晰，养成良好的解题习惯，逐步提高准确率和速度。
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