Lý thuyết: Bài 56. Rút gọn phân số - SGK Kết nối tri thức

Rút gọn phân số là tìm phân số mới bằng phân số ban đầu như có tử số và mẫu số bé hơn

🎃Tổng hợp đề thi học kì 2 lớp 4 tất cả các môn - Kết nối tri thức

Toán - Tiếng Việt - Tiếng Anh

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Rút gọn phân số là tìm phân số mới bằng phân số ban đầu như có tử số và mẫu số bé hơn

b) Cách rút gọn phân sốVí dụ: Rút gọn phân số $\frac{{20}}{{35}}$

Nhận xét: 20 và 35 cùng chia hết cho 5
Chia tử số và mẫu số cho 5, ta viết: $\frac{{20}}{{35}} = \frac{{20:5}}{{35:5}} = \frac{4}{7}$
Ta nói: Phân số $\frac{{20}}{{35}}$ đã được rút gọn thành phân số $\frac{4}{7}$

Lưu ý:

Phân số được rút gọn như $\frac{4}{7}$ có đặc điểm:”Tử số và mẫu số không cùng chia hết cho số tự nhiên nào lớn hơn 1”. Phân số $\frac{4}{7}$ là phân số tối giản.
Khi rút gọn phân số, ta phải rút gọn đến phân số tối giản

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Luyện Bài Tập Trắc nghiệm Toán lớp 4 - Kết nối tri thức - Xem ngay

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