Giải bài 1 trang 153 - SGK Toán lớp 5

Hướng dẫn:

$1m = \dfrac{1}{1000}km \\ 1dm = \dfrac{1}{10}m \\ 1cm = \dfrac{1}{100}cm \\ 1mm = \dfrac{1}{1000}m$

Bài giải:

a)

$4\text{km} 382\text{m} = 4,382\text{km} \\ 2\text{km} 79\text{m} = 2,079\text{km} \\ 700\text{m} = 0,7\text{km}$

b)

$7\text{m} 4\text{dm} =7,4\text{m} \\ 5\text{m} 9\text{cm} = 5,09\text{m} \\ 5\text{m} 75\text{mm} = 5,075\text{m}$