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P3 maths・3N1

5-digit numbers

Numbers with five digits: ten thousands make one ten thousand, and what the digit in the ten thousands place means; reading and writing them, and counting on or back from a given number (such as from 9990 to 10 000); telling odd from even by the units digit; and comparing numbers with =, > and <.

Key words

ChineseEnglish
五位數5-digit number
萬位ten thousands place
大於greater than (>)
小於less than (<)
單數odd number
雙數even number

The 4 short lessons and the chapter test

Lessons are in Chinese for now.

  1. 萬和讀數
  2. 萬位和數的組成
  3. 數數、單數和雙數
  4. 比較、排列和砌數
  5. 章節測驗 (chapter test)

Sample questions (in Chinese)

Question 1位值表表示的數是多少?

萬位千位百位十位個位

Answer and explanation

答案:74316

為甚麼?萬位 7 粒、千位 4 粒、百位 3 粒、十位 1 粒和個位 6 粒,所以是 74316。沒有圓粒的位要寫 0。

Question 284300 怎樣讀?

  1. 八萬五千三百
  2. 八萬四千三百
  3. 八百四十三
  4. 八萬四千四百
Answer and explanation

答案:B.八萬四千三百

為甚麼?84300 讀作「八萬四千三百」。末尾的 0 不用讀出來。

Question 381365 的數字「5」表示多少?

表示 。

Answer and explanation

答案:表示 5。

為甚麼?81365 的「5」在個位,表示 5 個一,即是 5。

Question 4倒數,每 1 個一數,填上空格。

90001、90000、89999、89998、

Answer and explanation

答案:90001、90000、89999、89998、89997

為甚麼?每次少 1:90001、90000、89999、89998、89997。

Based on learning unit 3N1 of the Education Bureau’s Primary Mathematics Curriculum (2017).

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