zamiana na ary
0,02 ha
1ha = 100a
0,02 * 100 = 2 (ary)
3200m^2
Jeżeli: 
to: 
0,5m^2
wyliczenie z proporcji:
100 m^2 = 1 a
0,5 m^2 = x arów
100x = 0,51
x = 0,5 / 100
x=0,005
320000m^2
100m * 100m = 10000m^2 = 1 ha
320000m^2/10000 = 32 ha
1km^2 1000m * 1000m = 1000000m^2 = 100ha
0,7 * 100 = 70ha
/ to znak dzielenia
zamiana na m^2
1a = 100m^2 (bo jest to 1/100 ha a 1ha ma 10000m^2 )
250a
250 * 100 = 25000m^2
0,4 ha
1ha = 100m * 100m =10000m^2
0,4 * 10000 = 4000m^2
1/4 a
1a = 100m^2
1/4a = 100 * 1/4 = 25
2,7 ha
1ha = 10000m^2
2,7 * 10000 = 27000m^2
zamiana na km^2
150 ha
100 ha = 1km^2
150 / 100 = 1,5 km^2
1000000a
1000000a = 10000ha
jeżeli 100ha = 1km^2
to 10000 /100 = 100km^2
45 ha
1ha = 1/100 km^2 ponieważ 1 km^2 = 100ha
45 * 0,01 = 0,45
Przeliczniki do zapamiętania
1 a = 10m * 10m
1 ha = 100m * 100m
1ha ma 100arów
1a=1/100ha
1km^2 = 1000m * 1000m
1 km^2=100ha (1000000m^2 / 10000m^2) = 100 )
