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4 m * 4 m = 400 cm * 400 cm = 160000 cm2

Each tile = 30 cm * cm = 900 cm2

So number of tiles required = 160000/900 = 177.77.. or 178 tiles.

However, this assumes that nearly all the offcuts are used. In real life, you should allow at least 10% for wastage. This is to allow for offcuts that are too small to be used and for tiles that break when cutting.

If you do not want some of the area to be tiled with fragments, you will need 14 tiles along each dimension (4 metres/30 cm, rounded UP) - making a total of 14*14 = 196 tiles.

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Q: How many tiles 30 cm X 30 cm do you need to fill a 4 meter X 4 meter flat surface?
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