a) 

Korzystamy z zależności:

$1\text{ha}=100\text{a},1\text{a}=100{\text{m}}^2,1{\text{km}}^2=10000\text{a}$

• $0,02\text{ha}=0,02\cdot 100\text{a}=2\text{a}$

• $3200{\text{m}}^2=3200:100\text{a}=32\text{a}$

• $0,5{\text{km}}^2=0,5\cdot 10000\text{a}=5000\text{a}$

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b) 

Korzystamy z zależności:

$1\text{ha}=10000{\text{m}}^2,1\text{ha}=100\text{a},1{\text{km}}^2=100\text{ha}$

• $320000{\text{m}}^2=320000:10000\text{ha}=32\text{ha}$

• $800\text{a}=800:100\text{ha}=8\text{ha}$

• $0,7{\text{km}}^2=0,7\cdot 100\text{ha}=70\text{ha}$

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c) 

Korzystamy z zależności:

$1\text{a}=100{\text{m}}^2,1\text{ha}=10000{\text{m}}^2$

• $250\text{a}=250\cdot 100{\text{m}}^2=25000{\text{m}}^2$

• $0,4\text{ha}=0,4\cdot 10000{\text{m}}^2=4000{\text{m}}^2$

• $\frac{1}{4}\text{a}=\frac{1}{4}\cdot 100{\text{m}}^2=25{\text{m}}^2$

• $2,7\text{ha}=2,7\cdot 10000{\text{m}}^2=27000{\text{m}}^2$

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d) 

Korzystamy z zależności:

$1{\text{km}}^2=100\text{ha},1{\text{km}}^2=10000\text{a}$

• $150\text{ha}=150:100{\text{km}}^2=1,5{\text{km}}^2$

• $1000000\text{a}=1000000:10000{\text{km}}^2=100{\text{km}}^2$

• $45\text{ha}=45:100{\text{km}}^2=0,45{\text{km}}^2$