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6 ft x 6 ft = 1828.8 mm * 1828.8 mm = 3,344,509.4 mm2
Area of each slab = 400*400 mm2 = 160,000 mm2
So minimum number of slabs = 3,344,509.4/160,000 = 20.9 ie 21 slabs.
However, this requires almost all the offcuts to be used and, unless the shape is an exact number of tiles across, you will end up with an area that is a mosaic.
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