A decimal rule typically has how many divisions on one edge?

A decimal rule is designed for precision in measurement, where each division represents a specific decimal fraction of an inch. Typically, a decimal rule will have ten divisions per inch, allowing users to measure in decimals of tenths. This is ideal for applications in welding and fabrication, where accurate measurements are critical to ensure the integrity of the welds and the alignment of parts.

Having ten divisions means that each division indicates one-tenth of an inch, making it simple to read and use without converting fractions. Consequently, it enables welders and fabricators to quickly take measurements to the nearest decimal, improving efficiency and accuracy in their work.

Other options suggest divisions such as 50, 100, or 20, which could represent metrics or specialized measuring tools not commonly associated with standard decimal rules. However, the conventional decimal rule's format is specifically based on ten divisions, which is what makes it the correct choice.