there sixty standard sized (215x112x65) bricks in a square metre, ergo 60 into 400= 6.666m sq.
450 bricks.
400
400 notes
As a square foot will require 8 bricks of standard size, we will require around 3500 bricks for 400 sq feet.
Depends on how big the bricks are.
More than 400 billion (400,000,000,000) Lego bricks.
If you are using the red brick which are 4" x 8" you will need 4.5 bricks per square foot (just call it five.) 5 x 400 is 2000 bricks.
The answer to this all depends on the size of the bricks.
It depends on the size of the bricks and their orientation when they are laid.
Math says 4 1/2 4"x8" bricks are needed to cover 1 sq. ft. So 9 bricks will cover 2 sq ft. That needs to happen 500 times so you need 9x500 or 4500 bricks sized 4"x8" to cover 1000 sq ft.
cover the top with bricks
8