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16" x 16" 1.777 square feet.
The area you need to fill is 63 square feet.
63 / 1.777 35.44, thus, mathematically, you will need 36 stepstones HOWEVER the true amount will vary depending on how you cut the edge slabs, and whether you make mistakes or not, i would advise getting an extra 10-ish stones to make sure you have enough, you can always find ornmental uses for the excess!
This is not so much a pure mathmatics problem as much as a practical question.
Think of it this way:
One stone is one foot four inches wide. Two stones equals two feet eight inches, three stones equal four feet. So, six stones wide by six stones long would make a pad 8'x8'.
You need a 9'x7' space filled. Six stones by six stones equals twelve stones. NowYou are twelve inches over on the 7' side and twelve inches under on the 9' side. If you cut true, you will need 17 stones. Take the 12" cut from the six stones on the 7' side and place them on the 9'foot side; this leaves a 12"x12" void in one corner that you will need to cut one more stone for.
This allows for no spacing between stones though.
What else can I help you with?
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