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Area of each board = 8*0.145 = 1.16 metres2.

Area to be covered = 7*7 = 49 metres2.

Number of boards required = Roundup(49/1.16) = Roundup(42.2) = 43.

This assumes that all offcuts are used. That may not be possible if any of the offcuts are shorter than the distance between the supporting joists.

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Q: How many decking boards at lenght 4.8 meters x 145 mm will I need to cover 7x7 meters?
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