1)Viet cac so do sau duoi dang phan so thap phan co :

a) Ten don vi la met

57m, 454dm, 6789cm, 3dm 5cm 7mm

2) Viet so thap phan co :

a) Nam muoi lam don vi,nam phan muoi,nam phan tram,nam phan nghin

b) Hai nghin khong tram linh hai don vi,tam phan tram

c) Khong don vi,mot phan nghin

1) Viet cac so do sau duoi dang so thap phan co :

Ten don vi la met 

57mm , 454dm , 6789cm , 3dm 5cm 7mm

2) Viet so thap phan co :

a. Nam muoi lam don vi , Nam phan muoi  , nam phan tram , nam phan nghin

b. Hai nghin khong tram linh hai don vi , tam phan tram

c. Khong don vi , mot phan nghin

ba don vi,chin phan muoi

bay chuc , hai don vi , nam phan muoi, bon phan tram

hai tram, tam chuc, chin phan muoi, bay phan tram, nam phan nghin

mot tram,hai don vi,bon phan muoi,mot phan tram,sau phan nghin      ( viet so thap phan)

chuyen so thap phan thanh hon so co chua phan so thap phan;

7,9 ; 12,35;  8,06; 72,308;  20,006.

3 nghin tam tram linh tam don vi,bay muoi ba phan nghin

Chuyen thanh phan so thap phan

viet so thap phan;

a) bay don vị , nam phan muoi.

b)sau muoi tu do vị , nam muoi ba phan tram.

c) ba tram linh mot đơn vị , bốn phần trăm.

d) khong don vi , hai phần nghìn.

e) ko don vi, hai tram linh nam phần nghìn.

Nam muoi bay don vi, sau phan muoi, hai phan tram, tam phan nghin

Chuyen thanh  so thap phan

nam don vi va chin phan muoi

bon muoi tam don vi ; bay phan muoi va hai phan tram

ko don vi, hai phan tram

ko don vi,bon tram linh bon phan nghin

ko don vi nam phan nghin

Cac chu so phan muoi, phan tram, phan nghin cua mot so thap phan co 3 chu so o phan thap phan la 3 so le lien tiep . Tong cac chu so o phan thap phan bang phan nguyen cua so do, cac chu so o phan nguyen va phan thap phan deu khac nhau . Tim    so thap phan do ?

viet so thap phan sau duoi dang ti so phan tram ; 1,68=