🧮 Day 1 Math: Mixed Fraction Operations (分数混合运算)
Hello, Sisi! Today we will learn about fraction multiplication 分数乘法 and fraction division 分数除法. This is a key topic for P6 Math and the PSLE exam!
📚 Key Vocabulary (重点词汇)
🔹 Part 1: Fraction Multiplication (分数乘法)
To multiply fractions 乘分数, we follow a simple rule:
📌 The Rule (规则)
Multiply the numerators（分子乘分子）, then multiply the denominators（分母乘分母）.
💡 Example (例题)
Q: Calculate 2/3 × 4/5
A:
- Numerators: 2 × 4 = 8
- Denominators: 3 × 5 = 15
- Answer = 8/15 (already in lowest terms)
🎮 Interactive Demo: See the Rule! (互动演示)
Click the button to watch the numbers move（移动）!
🔹 Part 2: Fraction Division (分数除法)
To divide fractions 除分数, we use the “flip and multiply”（颠倒相乘）method:
📌 The 3 Steps (三步法)
Step 1: Keep the first fraction as it is（保持不变）
Step 2: Change ÷ to ×, then flip the second fraction (reciprocal)（颠倒求倒数）
Step 3: Multiply as usual!（照常相乘！）
💡 Example (例题)
Q: Calculate 3/4 ÷ 2/3
A:
- Step 1: Keep 3/4
- Step 2: Change to × and flip → 3/4 × 3/2
- Step 3: 3 × 3 = 9, 4 × 2 = 8
- Answer = 9/8 = 1 1/8 (mixed number)
🎮 Interactive Demo: Flip & Multiply! (颠倒相乘演示)
🔹 Part 3: Simplifying Answers (化简答案)
Always simplify 化简 your answer to the lowest terms 最简分数! If the numerator is bigger than the denominator, convert to a mixed number（带分数）.
📌 How to Simplify (如何化简)
Find the HCF（最大公约数）of the numerator and denominator, then divide both by it.
Example: 6/8 → HCF of 6 and 8 is 2 → 3/4 ✅
🔹 Part 4: Practice Questions (练习题)
Q1: What is 1/4 × 1/2 = ?
Q2: What is 2/3 ÷ 1/3 = ?
Q3: Simplify 4/6 = ?
📝 Summary (本节总结)
- ✅ Multiply: Numerator × Numerator, Denominator × Denominator（分子乘分子，分母乘分母）
- ✅ Divide: Keep, Flip, Multiply（保持，颠倒，相乘）
- ✅ Always simplify（化简） to lowest terms
- ✅ Convert to mixed number（带分数） if numerator > denominator