How many ㎡ is 3 a?
3 a = 300 ㎡
It is 300 ㎡, so saying 300 ㎡ is fine — rounding is within 0.5%.
And how many a is 3 ㎡?
3 ㎡ = 0 a
Formula: ㎡ = a × 100
a to ㎡ around this value
1.2 a120㎡
1.4 a140㎡
1.6 a160㎡
1.8 a180㎡
2 a200㎡
2.2 a220㎡
2.4 a240㎡
2.6 a260㎡
2.8 a280㎡
3 a300㎡
3.2 a320㎡
3.4 a340㎡
3.6 a360㎡
3.8 a380㎡
4 a400㎡
4.2 a420㎡
4.4 a440㎡
4.6 a460㎡
4.8 a480㎡
5 a500㎡