Question

Where is 10 mm on a ruler in inches?

Answer

100% (3 rated)

The correct answer is: $0.3937\text{ in}$

Explanation

Convert using $1\text{ in}=25.4\text{ mm}$.

Steps:

  1. Relationship: $$1\text{ in}=25.4\text{ mm}$$
  2. Convert: $$10\text{ mm}=\frac{10}{25.4}\text{ in}=0.3937007874\text{ in}$$
  3. Rounded for typical use: $$\approx0.394\text{ in}$$

Therefore, 10 mm is about 0.394 inches — on a standard inch ruler it falls just past the 3/8″ mark (3/8″ = $0.375\text{ in}=9.525\text{ mm}$).