Lý thuyết: Tìm số trung bình cộng - SGK Cánh diều

Tìm số trung bình cộng

🙈Tổng hợp đề thi học kì 2 lớp 4 tất cả các môn - Cánh diều

Toán - Tiếng Việt - Tiếng Anh

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A. Số trung bình cộng

Lấy tổng số sách chia cho 3 được số sách san đều vào mỗi chồng: (11 + 15 + 10) : 3 = 12 (quyển)

Ta gọi 12 là số trung bình cộng của ba số 11 , 15 và 10

Ta nói: Trung bình mỗi chồng có 12 quyển sách.

Muốn tìm số trung bình cộng của nhiều số, ta tính tổng của các số đó, rồi lấy tổng tìm được chia cho số các số hạng.

Ví dụ: a) Số trung bình cộng của 46 và 24 là: (46 + 24) : 2 = 35b) Số trung bình cộng của 10, 20, 7, và 11 là: (10 + 20 + 7 + 11) : 4 = 12

B. Giải bài toán về tìm số trung bình cộng

Bài toánꦺ: Ba bạn Hiền, Hoa và Thanh vào rừng hái nấm. Hiền hái được 14 cây nấm, Hoa hái được 16 cây nấm và Thanh hái được 12 cây nấm. Hỏi trung bình mỗi bạn hái được bao nhiêu cây nấm?

Bài giảiTổng số cây nấm ba bạn hái được là:14 + 16 + 12 = 42 (cây)Trung bình mỗi bạn hái được số cây nấm là:42 : 3 = 14 (cây)Đáp số: 14 cây nấm

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