Lý thuyết: Các tính chất của phép cộng - SGK Cánh diều

Các tính chất của phép 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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1. Tính chất giao hoán của phép cộng

5 + 7 = 12 ; 7 + 5 = 12 nên 5 + 7 = 7 + 5

Khi thực hiện phép cộng hai số, ta có thể đổi chỗ các số hạng mà tổng không thay đổi.

2. Tính chất kết hợp của phép cộng

(3 + 5) + 6 = 8 + 6 = 143 + (5 + 6) = 3 + 11 = 14Vậy (3 + 5) + 6 = 3 + (5 + 6)

Khi cộng một tổng hai số với số thứ ba, ta có thể cộng số thứ nhất với tổng của số thứ hai và số thứ ba.

3. Cộng với số 0

7 + 0 = 7 ; 0 + 7 = 7

Số nào cộng với 0 cũng cho kết quả bằng chính số đó

Chia sẻ

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Luyện Bài Tập Trắc nghiệm Toán lớp 4 - Cánh diều - Xem ngay

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