Phan so 3 phan 4 viet duoi dang phan so thap phan la .a 0.34 b 0.75 c7.5 d3.4 cau 2 so thich hopde dien vaocho cham de co 360 kg =....tan cau so 3 10 % cua 9dm la.a 10 b 70 c9 d 0.9cau 4 thoi gian tu 8 gio kem 10 phut den 8 gio 30 phut la a 10 b 20 c 30 d 40 cau 5 the tich cua khoi go lap phuong co canh 5 cm la a 125 b 125 cm c 125 cm3 d 125 cm3 

viet 10 phan 27 duoi dang thuong cua 2 phan so co tu va máu la so co 1 chu so bang 4 cach

viet phan so 3/5 duoi dang so thap phan co mau so la 10 va co mau so la 100 . 

b viet hai phan so thap phan moi tim duoc thanh hai so thap phan 

c co the viet 3/5 thanh nhung so thap phan nao

viet cac phan so thap phan sau duoi dang thap phan 

a 1/10 1/100 1/1000 1/10000

b 84/10 225/100 6453/1000 25789/10000

khi viet so thap phan 0,100 duoi dang so thap phan, ban Lan viet 0,100 = 100/1000 ; ban My viet 0,100 = 10/100 ; ban Hung viet 0,100 = 1/100. Ai viet dung, ai viet sai. Tai sao ?

Chu so 5 trong so thap phan 20, 056 co gia tri la:a. 5 b. 5/10 c. 50 d. 5/ 100

hon so 5 6/1000 duoc viet duoi dang  so thap phan la: a. 5.6 b. 5.06 c. 5,0006 d. 5,0006

gia tri bieu thuc 60+8+0,5+0,002

cho 23m2 5 cm2=..........m2

a viet phan so 3/5 duoi dang phan so thap phan  co mau so la 10 va co mau so la 100 

b viet hai phan so thap phan moi tim duoc thanh hai so thap phan

c co the viet 3/5 thanh nhung so thap phan nao 

phan so 1\6 viet duoi dang so thap phan la

a 6,0

b 0,06

c 6,1

d 0,6

trung binh cong cua 3 so la 5/8 so thu ba bang trung binh cong cua so thu nhat va so thu hai so thu nhat hon so thu hai la 1/4 tim ba so do (viet dap so duoi dang so thap phan)