What is the decimal equivalent of a letter "E" drill bit, which is the same as a 1/4-inch fraction?

The decimal equivalent of a letter "E" drill bit corresponds to a specific size, which is commonly referenced in aviation maintenance and engineering contexts. A letter "E" drill bit is indeed equivalent to 1/4 inch in diameter.

To convert the fraction of 1/4 into decimal form, you divide the numerator (1) by the denominator (4). This results in 0.25, which is typically expressed with four decimal places as 0.2500.

Selecting this answer reflects an understanding of basic unit conversions between fractional and decimal measurements, which is an essential skill in the context of A&P practices where precise measurements are critical.