Mike Thorne sends us an alternate method for entering distances that can be more accurate than more common methods. "Try entering distances of inches in a drawing set up for feet by using fractions like 4/12 for 4". Using fractions enters a true distance, unlike manually typing the distance and rounding it to .33 or .3333 feet. This ensures the precision of your drafting."
Notes from Cadalyst Tip Patrol: This is a method that can be used regardless of the units. The metric system handles other units more easily than the imperial system does, avoiding the rounding errors that can occur and accrue when rounding inches to decimals. The example above assumes your units are set to feet; one unit equals one foot. Since there are 12 inches in one foot, one inch is equal to 1/12 of a foot. That means that 4 inches is the same as 4/12 of a foot. AutoCAD does the math for you. The distance will be more accurate and you don’t have to memorize the decimal equivalent.