Dewalt Construction Math, How to Use a Scale, Math Rules

DEWALT Construction Math Quick Check: Extreme Duty Edition (DEWALT Series) 1st Edition
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I go through how to calculate scale for residential construction. I use the scale of 1/4 inch per foot and figure it out with paper and pencil, with a calculator, and with a scale. How long is a wall from a plan?
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[@InJesusLED]

Great work! Very helpful!

[@ColfaxMath]

Thank you