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| k m 2 |
h
m
2
|
d a m 2 | m 2 | d m 2 | c m 2 | m m 2 |
| 1 k m 2 =100 h m 2 | 1 h m 2 = 100 d a m 2 = 0,01 k m 2 | 1 d a m 2 = 100 m 2 = 0,01 h m 2 | 1 m 2 =100 m 2 =0,01 d a m 2 | 1
d
m
2
= 100
c
m
2
= 0,01
m
2
|
1 c m 2 = 1000 m m 2 = 0,01 d m 2 | 1 m m 2 = 0,01 c m 2 |
Chú ý : Khi đo diện tích ruộng đất người ta còn dùng đơn vị héc-ta (ha)
1ha = 10000 m 2
a) 0,508 km2 = 50 ha 8000 m2 b) 71800 dam2 500dm2 = 718 ha 5 m2 c) 801 m2 350 cm2 = 8,01035 dam2 d) 601 ha 18 m2 = 6010,18 dam2 e) 901,105 ha = 9 km2 11050 m2
67 dam2 51m2 = 67 dam2 + 
m2 = 
dam2
82 dam2 7m2 = 82dam2 + 
m2 = 
dam2
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U
50 dam2 S ; 50000 m2 Đ
1/2 dam2 S ; 500 dam2 S
237dm2=dam