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Calculating studs

This video teaches how to calculate the number of studs needed for one wall.

A 20 foot wall will need 15 studs. Divide 20 by 4 = 5 or divide 20 by 2 twice 20 divided by 2 = 10 and 10 divided by 2 = 5. Next subtract the answer 5 from 20 and you'll get 15. 15 studs are needed for 20 foot wall.