How many 10x10 areas are in 4000 square feet?

Answer 1

There need not be any as an area can have any shape; for example 4000 sq ft can be a rectangle with side lengths 1 ft and 4000 ft - as this rectangle has a width of 1 ft a 10 ft by 10 ft area cannot be extracted from it.

However, if you are asking how many sections with the same area as a square of sides 10 ft can be made in an area of 4000 sq ft, then:

4000 sq ft ÷ (10 ft × 10 ft) = 4000 sq ft ÷ 100 sq ft = 40.