How many 12 inch x 12 inch stones would you need for a 10 x 10 patio?

Answer 1

You need 100 12 by 12 inch stones to cover a 10 x 10 foot patio. Since the area of the patio is 10' by 10' = 100 square feet, and each stone is 1 foot * 1 foot = 1 square foot, 100 square feet divided by 1 square foot = 100.

Answer 2

For a 10in x 10in patio, 1 stone would be enough. If you did not mean a 10in x 10in patio you should have said what unit of measurement you did mean - feet, yards, metres, or something else.