Giải thích các bước giải:

 a)36m2=3 600dm2

10km2=10 00 0000m2

120dm2=12 000cm2

1km2 325m2=1 000 325m2

9m2 53dm2=953dm2

b)93 100cm2=931dm2

6300dm2=63m2

10 000 000m2=10km2

430dm2=4m2 30dm2

1 000 325m2=1km2 325m2

a)

$1m^{2}$  = $100dm^{2}$  

$36m^{2}$  = $100 x 36 = 3600dm^{2}$  

$1km^{2}$  = $1000000m^{2}$  

$10km^{2}$  = $1000000 x 10 = 10000000m^{2}$  

$1dm^{2}$  = $100cm^{2}$  

$120dm^{2}$  = $100 x 120 = 12000cm^{2}$  

$1km^{2}$  = $1000000m^{2}$  

$1km^{2}$ $325m^{2}$  = $1000000 + 325 = 1000325m^{2}$

$1m^{2}$  = $100dm^{2}$  

$1m^{2}$ $53dm^{2}$  = $100 + 53 = 153dm^{2}$

b)

$100cm^{2}$  = $1dm^{2}$  

$93100cm^{2}$  = $93100 : 100 = 931dm^{2}$  

$100dm^{2}$  = $1m^{2}$  

$6300cm^{2}$  = $6300 : 100 = 63m^{2}$  

$1000000m^{2}$  = $1km^{2}$  

$10000000m^{2}$  = $10000000 : 1000000 = 10km^{2}$  

$100dm^{2}$  = $1m^{2}$

$400dm^{2}$  = $4m^{2}$

$430dm^{2}$  = $4m^{2}$ $30dm^{2}$  

$1000000m^{2}$  = $1km^{2}$

$1000325m^{2}$  = $1km^{2}$ $325dm^{2}$