10
The area of a 4x8 paver is 32 sq ft. To find the number needed, divide 312/32 = 9.75
Since you can only buy whole pavers, 10 will be required. Also note that the shape of the area to be paved may mean that more than 10 are needed.
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240 Get extra for breakage.
12 inch * 12 inch = 1 ft * 1 ft = 1 sq ft. Therefore, a minimum of 72 pavers are needed. That answer assumes that the shape is well behaved and the pavers do not need to be cut. Or that, if they are, all the offcuts are used. Pavers may need to be cut/trimmed if, for example, the area is circular.
16"=1.33" 1.33 x 1.33 = 1.7689 sq ft 224 / 1.7689 = 126.63 pavers
101.25 pavers
144 of them.