Question

what is the approximate width in millimeters of the outside of the washer, as measured by the meter stick?

Explanation:

Step1: Identify scale on ruler

The ruler shows centimeters and millimeters. Each centimeter is divided into 10 equal parts, each part representing 1 millimeter.

Step2: Read measurement

The outside - edge of the washer starts at approximately 1 cm (10 mm) and ends at approximately 2.5 cm (25 mm).

Step3: Calculate width

Subtract the starting point from the ending point. $25 - 10=15$ mm.

Answer:

15