Fractions (II)
Proper fractions, improper fractions and mixed numbers, and changing between improper fractions and mixed numbers; equivalent fractions and simplest form; comparing fractions with the same denominator; adding and subtracting up to three fractions with the same denominator; and word problems.
Key words
| Chinese | English |
|---|---|
| 真分數 | proper fraction |
| 假分數 | improper fraction |
| 帶分數 | mixed number |
| 擴分 | expanding a fraction |
| 約分 | reducing a fraction |
| 最簡分數 | simplest form |
The 9 short lessons and the chapter test
Lessons are in Chinese for now.
- 真分數和假分數
- 假分數化帶分數
- 帶分數化假分數
- 擴分
- 約分和最簡分數
- 比較分數
- 分數加法
- 分數減法
- 應用題
- 章節測驗 (chapter test)
Sample questions (in Chinese)
Question 1126 是真分數、假分數還是帶分數?
- 帶分數
- 真分數
- 假分數
Answer and explanation
答案:C.假分數
為甚麼?分子比分母小的是真分數;分子等於或大於分母的是假分數;由整數和真分數合成的是帶分數。所以 126 是假分數。
Question 2把假分數化為帶分數。
329 = 9
Answer and explanation
答案:329 = 3 59
為甚麼?32 ÷ 9 = 3 … 5,即是 3 個整體(279)和 59,所以 329 = 3 59。
Question 3把帶分數化為假分數。
2 34 = 4
Answer and explanation
答案:2 34 = 114
為甚麼?1 = 44,所以 2 = 84(2 × 4 = 8)。再加上 34:8 + 3 = 11,所以 2 34 = 114。
Question 4把 1520 約分至最簡分數。
1520 =
Answer and explanation
答案:1520 = 34
為甚麼?15 和 20 的 H.C.F. 是 5。分子和分母都除以 5:15 ÷ 5 = 3,20 ÷ 5 = 4。3 和 4 的公因數只有 1,所以 34 是最簡分數。
Based on learning unit 4N6 of the Education Bureau’s Primary Mathematics Curriculum (2017).