Giải bài 3 trang 153 - SGK Toán lớp 5
Viết số thích hợp vào chỗ chấm (theo mẫu):
\(a) \\ 5285\text{m} = 5\text{km} 285 \text{m} = 5, 285\text{km} \\ 1827\text{m} = …\text{km}…\text{m} = …\text{km} \\ 2063\text{m} = …\text{km}…\text{m} = …\text{km} \\ 702\text{m} = …\text{km}…\text{m} = …\text{km} \\ \)
\(b) \\ 34\text{dm} = ...\text{m}…\text{dm} = …\text{m} \\ 786\text{cm} = …\text{m}…\text{cm} = …\text{m} \\ 408\text{cm} = …\text{m}…\text{cm} = …\text{m} \\ \)
\(c) \\ 6258\text{g} = 6\text{kg} 258\text{g} = 6,258\text{kg} \\ 2065\text{g} = …\text{kg}…\text{g} = …\text{kg} \\ 8047\text{kg} = …\text{tấn}…\text{kg} = …\text{tấn} \)
Hướng dẫn:
Hai đơn vị đo độ dài liền kề gấp kém nhau \(10\) lần.
Hai đơn vị đo khối lượng liền kề gấp kém nhau \(10\) lần.
Bài giải:
\(a) \\ 5285\text{m} = 5\text{km} 285 \text{m} = 5, 285\text{km} \\ 1827\text{m} =1\text{km}827\text{m} =1,827\text{km} \\ 2063\text{m} = 2\text{km}63\text{m} =2,063\text{km} \\ 702\text{m} = 0\text{km}702\text{m} = 0,702\text{km} \\ \)
\(b) \\ 34\text{dm} = 3\text{m}4\text{dm} =3,4\text{m} \\ 786\text{cm} = 7\text{m}86\text{cm} = 7,86\text{m} \\ 408\text{cm} =4\text{m}8\text{cm} = 4,08\text{m} \\ \)
\(c) \\ 6258\text{g} = 6\text{kg} 258\text{g} = 6,258\text{kg} \\ 2065\text{g} = 2\text{kg}65\text{g} = 2,065\text{kg} \\ 8047\text{kg} = 8\text{tấn}47\text{kg} = 8,047\text{tấn} \)