How do you convert 22.5 mm to inches?

Hint: As the formula, to convert millimeters into inches is the length divided by $25.4$, so we will divide the given length by $25.4$ to convert it into inches. Then by simplifying the division we will get the desired answer.

Complete step-by-step solution:
We have been given the measure $22.5$ mm.
We have to convert the given measure of mm to inches.
We know that both the units given are units of length. We have to convert the given unit of millimeters into inches. Now, we know that the length in inches is equal to millimeters divided by $25.4$. The formula to convert millimeters into inches is the length divided by $25.4$.
Now, dividing the given measure $22.5$ mm by $25.4$, then we will get
$\Rightarrow \dfrac{22.5}{25.4}$
Now, simplifying the above division we will get
$\Rightarrow 0.8858\text{ inches}$
Now, rounding off the decimal value we will get
$\Rightarrow 0.886\text{ inches}$
Hence by converting $22.5$ mm to inches we will get the value $0.886\text{ inches}$.

Note: The units millimeter, centimeter and inch are the units to measure the length. Measurement varies when compared in length and is different in different units. Inch is the unit used to measure smaller scales for example to measure a length of chalk we will use the measuring unit inch. When converting units the point to be remembered is that the value in inches is less than the value in millimeters.