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Dividing Fractions # maths divide fractions

The division of the fraction > > changes the division to times, reverses the numerator to the 🚀🚀 recite.

2025/8/16 Edited to

... Read moreเวลาสอน/ทบทวนเรื่อง “การหารเศษส่วน” ฉันจะให้จำประโยคเดียวก่อนเลย: เปลี่ยนหารเป็นคูณ แล้วกลับเศษเป็นส่วน (invert) จากนั้นค่อยคูณและย่อส่วนให้เรียบร้อย วิธีนี้ช่วยให้ทำแบบฝึกหัด ป.5 ได้เร็วขึ้นมาก โดยไม่หลงเครื่องหมาย 1) หลักการสำคัญก่อนเริ่ม - หารด้วยเศษส่วน = คูณด้วยเศษส่วนกลับด้าน - “กลับเศษเป็นส่วน” ทำเฉพาะ “ตัวหาร” (ตัวที่อยู่หลังเครื่องหมาย ÷) เท่านั้น ไม่ใช่กลับทั้งโจทย์ - หลังคูณเสร็จอย่าลืม “ย่อส่วน” ให้อยู่ในรูปอย่างต่ำ 2) วิธีทำทีละขั้น (ใช้ได้กับทุกข้อ) ขั้นที่ 1: เขียนโจทย์ให้อยู่ในรูปเศษส่วนก่อน (จำนวนคละ/จำนวนเต็มแปลงเป็นเศษเกิน) ขั้นที่ 2: เปลี่ยน ÷ เป็น × ขั้นที่ 3: กลับเศษเป็นส่วนเฉพาะตัวหาร ขั้นที่ 4: คูณเศษกับเศษ และส่วนกับส่วน ขั้นที่ 5: ย่อส่วน/แปลงเป็นจำนวนคละถ้าจำเป็น 3) ตัวอย่างโจทย์เศษส่วน ป.5 พร้อมเฉลย ตัวอย่างที่ 1: 3/4 ÷ 2/5 = 3/4 × 5/2 = 15/8 = 1 7/8 ตัวอย่างที่ 2: 5/6 ÷ 1/3 = 5/6 × 3/1 = 15/6 = 5/2 = 2 1/2 ตัวอย่างที่ 3 (จำนวนเต็ม): 2 ÷ 3/5 แปลง 2 = 2/1 = 2/1 × 5/3 = 10/3 = 3 1/3 ตัวอย่างที่ 4 (จำนวนคละ): 1 1/2 ÷ 2/3 แปลง 1 1/2 = 3/2 = 3/2 × 3/2 = 9/4 = 2 1/4 4) ข้อผิดพลาดที่เจอบ่อย (และวิธีแก้) - เผลอกลับเศษเป็นส่วนผิดตัว: ให้ชี้ด้วยนิ้วเลยว่า “ตัวหลัง ÷” เท่านั้นที่กลับ - ลืมแปลงจำนวนคละ/จำนวนเต็ม: ก่อนทำให้เช็กว่าทุกตัวเป็น “เศษส่วน” แล้ว - ไม่ย่อส่วน: แนะนำย่อแบบตัดกันก่อนคูณ เช่นตัด 3 กับ 6 เพื่อลดตัวเลข 5) แบบฝึกหัดสั้น ๆ ให้ลองทำ (พร้อมเฉลย) ข้อ 1: 2/3 ÷ 4/5 = 2/3 × 5/4 = 10/12 = 5/6 ข้อ 2: 7/8 ÷ 1/2 = 7/8 × 2/1 = 14/8 = 7/4 = 1 3/4 ข้อ 3: 3 ÷ 2/7 = 3/1 × 7/2 = 21/2 = 10 1/2 ถ้าทำตามนี้ได้คล่อง ข้อสอบ “วิธีการหารเศษส่วน” จะกลายเป็นบทที่ง่ายมาก เพราะเราใช้กติกาเดิมทุกข้อ: เปลี่ยนหารเป็นคูณ กลับเศษเป็นส่วน แล้วคูณ-ย่อส่วนให้สวย ๆ

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