5 acres = 20,234.2821 square meters
800sq metres is 0.197684 acres.
05 acres = 5 acres = 20234 sq metres.
0.46 acres is 1,861.554 square metres.
200 acres is 809,370 square meters.
That is 3.45 acres- not quite 3 and a half.
4000 square metres is 0.988 acres. Saying that one acre is 4000 square metres is likely to be an adequate approximation, unless you are dealing with tens of thousands of acres.
2000 sq metres = 0.4942 acres
1.5 acres = 6,070.29 square meters
7000 square metres = 1.72973767 acres
7559 sq metres = 1.868 acres.
2,000 square meters = 0.494210763 acres.
2800 sq metres = 0.6919 acres