If the tiles are 12x12" you need 640 of them...if not, on the tile box it will tell you how many ft. you can do per box.
There are 12 inches in a foot, so 640/12 = 53.3333 feet.
There are 30.48 centimetres in one foot. Therefore, rounded to two decimal places, 640 centimetres is equal to 640/30.48 = 21.00 feet.
There are 0.3048 metres in one foot. Therefore, rounded to two decimal places, 640 metres is equal to 640/0.3048 = 2099.74 feet.
4.4444. 144 square inches to a square foot.
A square foot is a unit of area. A centimetre is a unit of length. The two units are therefore incompatible.
640 grams = 22.57ounces.
There are 640 acres in a section.
first u need 90 then u need 640 ,1640 2630
640 ounces = 40 pounds
640
Depens how wide the 640 miles are.
640/24 = 26.67 days