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Let's review!!✨😍

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... Read moreวันนี้อยากมาแชร์ประสบการณ์และเทคนิคการแก้โจทย์คณิตศาสตร์เกี่ยวกับการแบ่งเงินตามอัตราส่วน 7:3 ซึ่งเป็นเรื่องที่เจอบ่อยในข้อสอบเข้าม.1 จากโจทย์ที่ให้พี่น้องสองคนแบ่งเงินกันในสัดส่วน 7 ต่อ 3 โดยน้องได้รับน้อยกว่าพี่ 5,240 บาท เราสามารถหาจำนวนเงินที่พี่ได้รับได้โดยใช้หลักการหารย่อยอัตราส่วน โดยคำนวณส่วนต่างระหว่างสัดส่วนคือ 7-3=4 ส่วน ซึ่งถ้า 4 ส่วนนี้เท่ากับ 5,240 บาท ก็สามารถหา 1 ส่วนได้จากการนำ 5,240 หารด้วย 4 จากนั้นนำผลลัพธ์ไปคูณกับ 7 จะได้จำนวนเงินที่พี่ได้รับ จากนั้นเมื่อรู้จำนวนเงินทั้งหมดที่พี่ได้รับ ก็สามารถบอกได้ว่าพี่สามารถนำไปซื้อกระเป๋าใบละ 850 บาทได้กี่ใบ เช่น ถ้าพี่มีเงิน 6,200 บาท ก็ซื้อได้ 6,200 ÷ 850 ≈ 7 ใบ การฝึกทำโจทย์แบบนี้ช่วยให้เข้าใจการประยุกต์ใช้อัตราส่วนในชีวิตจริงอย่างเป็นรูปธรรมมากขึ้น และยังช่วยให้นักเรียนเตรียมพร้อมสำหรับการสอบเข้าที่ต้องการความเข้าใจเรื่องสัดส่วนและการคำนวณแบบนี้ นอกจากนี้ยังแนะนำว่า ควรทำโจทย์ซ้ำๆ เพื่อความคล่องแคล่ว และลองเปลี่ยนตัวเลขในโจทย์เพื่อทดสอบความเข้าใจของตนเองอีกด้วย ผมเองเคยใช้วิธีนี้แก้โจทย์แบบเดียวกันในช่วงเตรียมสอบ โดยการวาดรูปและเขียนอัตราส่วนช่วยให้จำง่ายและลดความสับสน ทำให้ตีโจทย์ได้ถูกต้องและรวดเร็วขึ้น หวังว่าการแชร์ประสบการณ์นี้จะช่วยให้เพื่อนๆ ที่กำลังฝึกคณิตศาสตร์เรื่องอัตราส่วนมีความมั่นใจและทำโจทย์ได้ดีขึ้นครับ

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