Câu 3: Trang 44 - sgk Toán lớp 3
Tính (theo mẫu)
25dam + 50dam = 45dam – 16dam =
8dam + 12dam = 67 dam – 25dam =
36dam + 18dam = 72dam – 48dam =
Bài Làm:
25dam + 50dam = 75 dam 45dam – 16dam = 29 dam
8dam + 12dam = 20 dam 67 dam – 25dam = 42 dam
36dam + 18dam = 54 dam 72dam – 48dam = 24 dam