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P4 maths・4N6

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

ChineseEnglish
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.

  1. 真分數和假分數
  2. 假分數化帶分數
  3. 帶分數化假分數
  4. 擴分
  5. 約分和最簡分數
  6. 比較分數
  7. 分數加法
  8. 分數減法
  9. 應用題
  10. 章節測驗 (chapter test)

Sample questions (in Chinese)

Question 1126 是真分數、假分數還是帶分數?

  1. 帶分數
  2. 真分數
  3. 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).

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