【八年级上册物理长度换算题100道及答案】在八年级物理学习中，长度的单位换算是一个重要的基础知识点。掌握不同长度单位之间的转换关系，有助于提高学生对物理量的理解和实际应用能力。为了帮助学生更好地巩固这一知识点，下面整理了100道常见的长度换算题，并附有详细答案，便于复习和练习。
一、单位换算基础知识回顾
常见的长度单位包括：
- 千米（km）
- 米（m）
- 分米（dm）
- 厘米（cm）
- 毫米（mm）
它们之间的换算关系为：
1 km = 1000 m
1 m = 10 dm = 100 cm = 1000 mm
1 dm = 10 cm = 100 mm
1 cm = 10 mm
二、题目与答案汇总表（共100题）
| 题号 | 题目 | 答案 |
| 1 | 2 m = ? cm | 200 cm |
| 2 | 500 mm = ? cm | 50 cm |
| 3 | 3.5 km = ? m | 3500 m |
| 4 | 800 cm = ? m | 8 m |
| 5 | 6000 mm = ? m | 6 m |
| 6 | 2.5 m = ? mm | 2500 mm |
| 7 | 10 dm = ? cm | 100 cm |
| 8 | 0.5 km = ? m | 500 m |
| 9 | 7000 m = ? km | 7 km |
| 10 | 1.2 m = ? dm | 12 dm |
| 11 | 300 cm = ? dm | 30 dm |
| 12 | 1500 mm = ? m | 1.5 m |
| 13 | 0.8 m = ? mm | 800 mm |
| 14 | 4.2 km = ? m | 4200 m |
| 15 | 90 dm = ? m | 9 m |
| 16 | 5000 mm = ? m | 5 m |
| 17 | 2.4 m = ? cm | 240 cm |
| 18 | 0.05 km = ? m | 50 m |
| 19 | 600 cm = ? m | 6 m |
| 20 | 1000 mm = ? m | 1 m |
| 21 | 1.5 km = ? m | 1500 m |
| 22 | 700 mm = ? cm | 70 cm |
| 23 | 30 dm = ? m | 3 m |
| 24 | 0.6 m = ? cm | 60 cm |
| 25 | 1200 cm = ? m | 12 m |
| 26 | 8000 mm = ? m | 8 m |
| 27 | 1.8 m = ? mm | 1800 mm |
| 28 | 0.2 km = ? m | 200 m |
| 29 | 450 cm = ? m | 4.5 m |
| 30 | 1500 dm = ? m | 150 m |
| 31 | 2.3 m = ? dm | 23 dm |
| 32 | 100 mm = ? cm | 10 cm |
| 33 | 6000 m = ? km | 6 km |
| 34 | 0.75 m = ? cm | 75 cm |
| 35 | 2500 mm = ? m | 2.5 m |
| 36 | 1.2 km = ? m | 1200 m |
| 37 | 350 cm = ? m | 3.5 m |
| 38 | 4000 mm = ? m | 4 m |
| 39 | 1.6 m = ? cm | 160 cm |
| 40 | 0.08 km = ? m | 80 m |
| 41 | 1000 cm = ? m | 10 m |
| 42 | 5000 cm = ? m | 50 m |
| 43 | 2.7 m = ? mm | 2700 mm |
| 44 | 0.9 km = ? m | 900 m |
| 45 | 120 cm = ? dm | 12 dm |
| 46 | 1.1 m = ? dm | 11 dm |
| 47 | 600 mm = ? dm | 6 dm |
| 48 | 3.2 km = ? m | 3200 m |
| 49 | 400 mm = ? cm | 40 cm |
| 50 | 2.1 m = ? cm | 210 cm |
| 51 | 0.01 km = ? m | 10 m |
| 52 | 800 cm = ? dm | 80 dm |
| 53 | 1.5 m = ? mm | 1500 mm |
| 54 | 5000 mm = ? dm | 500 dm |
| 55 | 2.6 m = ? cm | 260 cm |
| 56 | 0.7 km = ? m | 700 m |
| 57 | 100 dm = ? m | 10 m |
| 58 | 300 mm = ? cm | 30 cm |
| 59 | 1.4 km = ? m | 1400 m |
| 60 | 600 cm = ? dm | 60 dm |
| 61 | 0.05 m = ? mm | 50 mm |
| 62 | 2.9 m = ? dm | 29 dm |
| 63 | 400 cm = ? m | 4 m |
| 64 | 1.7 km = ? m | 1700 m |
| 65 | 100 mm = ? dm | 1 dm |
| 66 | 3.8 m = ? cm | 380 cm |
| 67 | 0.6 m = ? dm | 6 dm |
| 68 | 7000 mm = ? m | 7 m |
| 69 | 2.5 km = ? m | 2500 m |
| 70 | 50 dm = ? m | 5 m |
| 71 | 1.3 m = ? mm | 1300 mm |
| 72 | 0.4 km = ? m | 400 m |
| 73 | 900 cm = ? m | 9 m |
| 74 | 1200 mm = ? m | 1.2 m |
| 75 | 2.8 m = ? cm | 280 cm |
| 76 | 0.03 km = ? m | 30 m |
| 77 | 1500 mm = ? dm | 15 dm |
| 78 | 4.5 m = ? cm | 450 cm |
| 79 | 0.1 km = ? m | 100 m |
| 80 | 1000 mm = ? dm | 10 dm |
| 81 | 3.7 m = ? mm | 3700 mm |
| 82 | 0.9 m = ? cm | 90 cm |
| 83 | 600 dm = ? m | 60 m |
| 84 | 2.2 m = ? dm | 22 dm |
| 85 | 1.0 km = ? m | 1000 m |
| 86 | 400 cm = ? dm | 40 dm |
| 87 | 500 mm = ? cm | 50 cm |
| 88 | 3.0 km = ? m | 3000 m |
| 89 | 0.8 m = ? dm | 8 dm |
| 90 | 1.9 m = ? cm | 190 cm |
| 91 | 700 mm = ? m | 0.7 m |
| 92 | 2.0 km = ? m | 2000 m |
| 93 | 600 cm = ? dm | 60 dm |
| 94 | 1.6 m = ? dm | 16 dm |
| 95 | 0.07 km = ? m | 70 m |
| 96 | 3.4 m = ? mm | 3400 mm |
| 97 | 0.5 m = ? cm | 50 cm |
| 98 | 2000 mm = ? m | 2 m |
| 99 | 4.0 m = ? cm | 400 cm |
| 100 | 1.0 m = ? mm | 1000 mm |
三、总结
通过以上100道长度换算题，学生可以系统地练习从千米到毫米之间的单位换算，强化对基本物理量单位的理解和应用能力。建议在做题过程中注意单位间的进制关系，避免出现小数点位置错误或单位混淆的问题。同时，建议结合实际生活中的测量场景进行练习，提升综合运用能力。
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