Basic division
Two meanings of division: sharing equally (21 shared into 3 groups) and grouping (how many 7s in 21); the ÷ sign, dividend, divisor, quotient and remainder; that the remainder is always smaller than the divisor; using the times tables to divide, and multiplication to check; and division word problems, including when one more group is needed.
Key words
| Chinese | English |
|---|---|
| 除法 | division |
| 被除數 | dividend |
| 除數 | divisor |
| 商 | quotient |
| 餘數 | remainder |
| 平均分 | share equally |
The 12 short lessons and the chapter test
Lessons are in Chinese for now.
- 平均分
- 每幾個一份
- 除法算式
- 乘法和除法的關係
- 一組乘除算式
- 找出未知數
- 有餘數的除法
- 餘數要比除數小
- 驗算除法
- 0 和 1 的除法
- 應用題
- 重溫
- 章節測驗 (chapter test)
Sample questions (in Chinese)
Question 118 張貼紙平均分給 2 位同學,每人分得多少張?
18 ÷ 2 =
Answer and explanation
答案:18 ÷ 2 = 9
為甚麼?把 18 平均分成 2 等份,用除法。想一想:2 乘以多少等於 18?因為 2 × 9 = 18,所以 18 ÷ 2 = 9。每人分得 9 張。
Question 2計算。
45 ÷ 5 =
Answer and explanation
答案:45 ÷ 5 = 9
為甚麼?想一想:5 乘以多少等於 45?因為 5 × 9 = 45,所以 45 ÷ 5 = 9。
Question 3計算,寫出商和餘數。
20 ÷ 3 = …
Answer and explanation
答案:20 ÷ 3 = 6 … 2
為甚麼?想一想:3 乘以多少最接近 20,又不超過 20?3 × 6 = 18,3 × 7 = 21 就太大了。20 − 18 = 2,所以 20 ÷ 3 = 6 … 2。餘數 2 比除數 3 小。
Question 4在 58 ÷ 6 = 9 … 4 中,被除數是多少?
被除數是 。
Answer and explanation
答案:被除數是 58。
為甚麼?在 58 ÷ 6 = 9 … 4 中,58 是被除數,6 是除數,9 是商,4 是餘數。
Based on learning unit 2N6 of the Education Bureau’s Primary Mathematics Curriculum (2017).