Length and distance (III)
The metre (m), with 1 m = 100 cm; measuring longer objects and distances with a metre stick or tape measure, and recording them in metres and centimetres; changing to the same unit before comparing; choosing a suitable unit and tool; and estimating with ever-ready rulers such as a pace or an arm span.
Key words
| Chinese | English |
|---|---|
| 米 | metre (m) |
| 厘米 | centimetre (cm) |
| 米尺 | metre stick |
| 捲尺 | tape measure |
| 步距 | pace |
The 5 short lessons and the chapter test
Lessons are in Chinese for now.
- 認識米
- 用米還是厘米
- 量度和比較
- 永備尺和估計
- 重溫
- 章節測驗 (chapter test)
Sample questions (in Chinese)
Question 1填上空格。
5 米 84 厘米 = 厘米
Answer and explanation
答案:5 米 84 厘米 = 584 厘米
為甚麼?5 米 = 500 厘米。500 厘米 + 84 厘米 = 584 厘米。
Question 2「籃球場長約 28 __」,橫線上應填「米」還是「厘米」?
- 厘米
- 米
Answer and explanation
答案:B.米
為甚麼?28 厘米比一把 30 厘米的間尺還要短,不合理,所以應填「米」。
Question 3量度「黑板的長度」,用哪一種工具最合適?
- 米尺
- 滾輪
- 厘米尺
Answer and explanation
答案:A.米尺
為甚麼?黑板長幾米,邊是直的,用米尺量度最方便。
Question 4用 1 米長的米尺量度一段牆壁,量了 2 次,還多出 10 厘米。一段牆壁長多少?
米 厘米,即是 厘米。
Answer and explanation
答案:2 米 10 厘米,即是 210 厘米。
為甚麼?2 把米尺是 2 米,再多 10 厘米,所以是 2 米 10 厘米。2 米 = 200 厘米,200 + 10 = 210,即是 210 厘米。
Based on learning unit 2M1 of the Education Bureau’s Primary Mathematics Curriculum (2017).