Answer
0.04 m
Work Step by Step
40 mm to mPut the unit for the answer (meters) in the numerator of the unit
fraction; put the unit you want to change (mm) in the denominator.
Unit Fraction equivalent to 1 = $\frac{1 meters}{1000 millimeter}$
Multiply 40 mm times the unit fraction.
40 mm * $\frac{1 meters}{1000 millimeter}$ = 0.04 m
