Lý thuyết: Bài 74. Phép nhân phân số

Phép nhân phân số

ඣTổng hợp đề thi học kì 2 lớp 4 tất cả các môn - Chân trời sáng tạo

Toán - Tiếng Việt - Tiếng Anh

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Ví dụ♍: Tính diện tích hình chữ nhật có chiều dài $\frac{3}{4}$ m và chiều rộng $\frac{1}{2}$ m

Thực hành trên giấy kẻ ô vuông để tìm diện tích hình chữ nhật theo hình vẽ bên:

- Diện tích hình vuông lớn: 1m²

- Diện tích 1 ô vuông: $\frac{1}{{16}}$ m²

- Diện tích hình chữ nhật: $\frac{6}{{16}}$ m²

Thực hiện phép nhân hai phân số:

$\frac{3}{4} \times \frac{1}{2} = \frac{{3 \times 1}}{{4 \times 2}} = \frac{3}{8}$

Muốn nhân hai phân số, ta nhân tử số với tử số, nhân mẫu số với mẫu số

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Luyện Bài Tập Trắc nghiệm Toán lớp 4 - Chân trời sáng tạo - Xem ngay

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