Bài 3. a) 1dm =... cm 3dm =... cm 8dm =... cm 2dm =... cm 5dm =... cm 9dm =... cm b) 30cm =..
Bài 3.
a) 1dm = ... cm 3dm = ... cm 8dm = ... cm
2dm = ... cm 5dm = ... cm 9dm = ... cm
b) 30cm = ... dm 60cm = ... dm 70cm = ... dm
Giải
a) 1dm = 10cm 3dm = 30cm 8dm = 80cm
2dm = 20cm 5dm = 50cm 9dm = 90cm
b) 30cm = 3dm 60cm = 6dm 70cm = 7dm