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The answer depends on the units of measurement used for the numbers in the question: feet, metres, centimetres, miles, etc. Assuming they are measurements in millimetre, you will need 99 slabs. However, this assumes that the area is well behaved and also that you use most of the offcuts to fill up some of the space as a mosaic. If, for example, it is a path which is 0.230 mm wide then you may need 194 slabs.

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Q: How many paving slabs will i need for 20 sq meters if each slab is 450 x 450?
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