First Answer: 400,000 square metres is roughly equal to 4,000,000 square feet
Second Answer:
400,000 meters = 4,305,564' and 24"
Explanation why the first answer is correct:
As you know, one metre is about three feet, plus about three and a quarter inches.
So you get a big, 1m squared tile, and start covering it with square foot tiles: nine tiles fit on there easily.
But there's a strip about 3.25 inches wide on two sides of the big tile, so you cut one square foot tile into strips and they just fit nicely.
One metre squared is roughly ten square feet.
3,500 square feet is equal to 325.2 (325.1606) square meters.
40 square meters are 430.556417 square feet.
20 (square meters) = 215.278208 square feet
190 square meters = about 2,045.14 square feet.
89 square meters = ~958 square feet.
400,000ft² = 37,161.217m²
45 square meters is equal to 484.38 square feet.
3,500 square feet is equal to 325.2 (325.1606) square meters.
2,769 square feet = 257.25 square meters.
2270 square feet is equal to 210,8899 square meters.
10 square meters is equal to 107.639 square feet.
20 square meters are 215.278208 square feet.
17 square feet are 1.579352 square meters.
42 square meters are 452.084238 square feet.
630 square meters = ~6,781.3 (6,781.26356) square feet.
303 square meters = 3,261.46 square feet.
75 (square meters) = 807.293281 square feet.