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P2 maths・2N1

3-digit numbers

Numbers to 1000: showing them with base-ten blocks, and seeing that 10 tens make a hundred; the hundreds, tens and units places, and reading and writing the numbers; comparing and ordering them; odd and even numbers; counting in 20s, 25s, 50s and 100s; and estimating how many objects there are.

Key words

ChineseEnglish
百位hundreds place
十位tens place
個位units place
數粒base-ten blocks
估計estimate

The 5 short lessons and the chapter test

Lessons are in Chinese for now.

  1. 三位數
  2. 百位、十位和個位
  3. 比較和排列
  4. 單數、雙數和數數
  5. 估計和重溫
  6. 章節測驗 (chapter test)

Sample questions (in Chinese)

Question 1數粒表示的數是多少?

數粒表示 。

Answer and explanation

答案:數粒表示 353。

為甚麼?1 塊百是 100,1 條十是 10,1 粒一是 1。3 塊百是 300、5 條十是 50 和 3 粒一是 3,合起來是 353。

Question 2843 怎樣讀?

  1. 八千零四十三
  2. 八百五十三
  3. 八百四十三
  4. 八百三十四
Answer and explanation

答案:C.八百四十三

為甚麼?843 讀作「八百四十三」。

Question 3813 的數字「3」表示多少?

表示 。

Answer and explanation

答案:表示 3。

為甚麼?813 的「3」在個位,表示 3 個一,即是 3。

Question 4199 ○ 194
○ 內應填上哪個符號?

  1. >
  2. =
  3. <
Answer and explanation

答案:A.>

為甚麼?由最高位開始比較。百位和十位的數字相同;個位:9 大於 4。所以 199 大於 194,寫作 199 > 194。

Based on learning unit 2N1 of the Education Bureau’s Primary Mathematics Curriculum (2017).

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