Fractions (I)
Splitting a whole into equal parts, and using fractions (not more than 1) for part of one object or part of a set; numerator, denominator and fraction line; equivalent fractions from pictures, such as 1/2 = 2/4; that a fraction with equal numerator and denominator is 1, and one with numerator 0 is 0; comparing fractions with the same denominator or numerator; and adding and subtracting up to three fractions with the same denominator (answers not more than 1, and not simplified).
Key words
| Chinese | English |
|---|---|
| 分數 | fraction |
| 分子 | numerator |
| 分母 | denominator |
| 分數線 | fraction line |
| 等值分數 | equivalent fractions |
| 整體 | the whole |
The 10 short lessons and the chapter test
Lessons are in Chinese for now.
- 平均分
- 認識分數
- 分子、分母和分線
- 一組物件的部分
- 等值分數
- 等於 1 和 0 的分數
- 比較分數的大小
- 同分母分數加法
- 同分母分數減法
- 應用題
- 章節測驗 (chapter test)
Sample questions (in Chinese)
Question 1一包糖有 9 粒，吃了 1 粒（打了交叉的）。吃了的糖佔全包的幾分之幾？
吃了全包的 。
Answer and explanation
答案：吃了全包的 19。
為甚麼？全包有 9 粒，吃了 1 粒，所以是 19。
Question 2兩條紙條一樣長。看圖，填上空格。
12 = 6
Answer and explanation
答案：12 = 36
為甚麼？上面塗了 12，下面平均分成 6 份，塗了 3 份，塗色部分一樣大。所以 12 = 36，它們是等值分數。
Question 338 ◯ 36
圓圈內應填甚麼？
- >
- <
- =
Answer and explanation
答案：B．<
為甚麼？分子相同（都取 3 份），分母越大，每份越小，分數就越小。所以 38 < 36。
Question 4計算。
410 + 210 = 10
Answer and explanation
答案：410 + 210 = 610
為甚麼？分母相同，分母不變，分子相加：4 + 2 = 6，所以答案是 610。
Based on learning unit 3N5 of the Education Bureau’s Primary Mathematics Curriculum (2017).