To convert 5.5 mm to inches, there are a few simple steps you can follow. First, you need to know the conversion factor between millimeters and inches. This conversion factor is 1 inch = 25.4 millimeters.

Step 1: Write down the conversion factor.

1 inch = 25.4 millimeters

Step 2: Set up the equation using the conversion factor.

5.5 mm x (1 inch / 25.4 mm)

Step 3: Simplify the equation by dividing.

5.5 mm x (0.03937 inches)

Step 4: Multiply the numbers and units.

5.5 mm x 0.03937 inches = 0.21653 inches

Step 5: Round the final answer to the appropriate number of significant figures.

Since the original measurement is given to the nearest 0.1 mm, which has one significant figure, the final answer should also have one significant figure. Therefore, 0.21653 inches should be rounded to 0.2 inches.

Step 6: Write the final answer with its corresponding unit.

5.5 mm = 0.2 inches (rounded to one significant figure)

So, 5.5 mm is equivalent to 0.2 inches.