a ) 7 10 ; 13 100 ; 207 1000 b ) 72 100 ; 1073 10000

a ) 3 10 ; 11 100 ; 213 1000 . b ) 7 100 ; 129 10000 c ) 521 1000 .

8 d m 2 = 8 100 m 2 = 2 25 m 2 ; 1251 m 2 = 125 10000 m 2 = 1 80 m 2

444 d m 3 = 444 1000 m 3 = 111 250 m 3

307 m = 0,307km

5 d m = 5 10 m = 1 2 m ; 14 c m = 14 100 m = 7 50 m ; 250 m m = 250 1000 m = 1 4 m

a ) 3 10 ; 11 100 ; 213 1000 . b ) 7 100 ; 129 10000 c ) 521 1000 .

a ) 2 5 ; 8 25 ; 3 20 b ) 11 50 ; 21 500 c ) 333 500

1. a) 0,65 km ; 3,456km ; 7,035 km
    b) 5,6m ; 2,05m ; 8,094mm
2.a) 4,65 kg ; 7,085 kg
   b) 3,567 tấn ; 12,027tấn

1.a) 650m = 0,65km

    3km456m = 3,456km

    7km35m = 7,035km

b) 5m6dm = 5,6m

   2m5cm = 2,05m

   8m94mm = 8,094m

2. a) 4kg650g = 4,65kg 

        7kg85g = 7,085kg

b) 3tấn576kg  3,576tấn

    12tấn27kg = 12,027tấn

cái này rất dễ mà