The question, as stated, cannot be answered sensibly. An acre is a measure of area, with dimensions [L2]. A metre is a measure of distance, with dimensions [L]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
2.5 acres = 10,117.14 square meters.
18 acres is 72,843.48 square meters.
75,000 square meters is 18.53 acres.
2 acres = 8,093.7 square meters
Four acres is 16,187.4m2
2.72 acres = 11,007.45 square meters 1 acre = about 4046.86 square meters
About 10,120 square meters.
120000 sq metres = 29.7 acres
50 acres = 202343 sq metres, approx.
586 (sq meters) = 0.144803754 acres
You can't calculate meters into acres or acres into meters because they are incompatible measurements. If it was meters squared, that might be a bit different.
400 meters by 200 meters is about 19.8 acres.