* Know the conversion: 1 inch = 25.4 mm
* Set up a proportion: 4 mm / x inches = 25.4 mm / 1 inch
* Solve for x: Cross-multiply to get 4 mm * 1 inch = 25.4 mm * x inches
* Simplify: 4 inches = 25.4 mm * x inches
* Isolate x: Divide both sides by 25.4 mm: x inches = 4 inches / 25.4 mm
* Calculate: x ≈ 0.157 inches
Therefore, 4 mm is approximately 0.157 inches.
To express this as a fraction, you can round 0.157 to the nearest common fraction, which would be 1/6 of an inch.
