How many ㎡ is 1 a?
1 a = 100 ㎡
It is 100 ㎡, so saying 100 ㎡ is fine — rounding is within 0.5%.
And how many a is 1 ㎡?
1 ㎡ = 0 a
Formula: ㎡ = a × 100
a to ㎡ around this value
0.1 a10㎡
0.2 a20㎡
0.3 a30㎡
0.4 a40㎡
0.5 a50㎡
0.6 a60㎡
0.7 a70㎡
0.8 a80㎡
0.9 a90㎡
1 a100㎡
1.1 a110㎡
1.2 a120㎡
1.3 a130㎡
1.4 a140㎡
1.5 a150㎡
1.6 a160㎡
1.7 a170㎡
1.8 a180㎡
1.9 a190㎡
2 a200㎡