You can calculate it in a few steps:
Calculate the square footage of the deck: 12 ft × 12 ft = 144 ft².
Choose the size of a single decking board, e.g., 8 ft long and 0.5 ft wide.
Calculate the square footage of the decking board: 8 ft × 0.5 ft = 4 ft².
Find the number of decking boards needed (plus 10% for waste): 144 ft² / 4 ft² × 1.1 = 40.
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