* Know the conversion: 1 centimeter (cm) = 10 millimeters (mm)
* Convert centimeters to millimeters: 8 cm * 10 mm/cm = 80 mm
* Add the remaining millimeters: 80 mm + 7 mm = 87 mm
Therefore, there are 87 millimeters in 8 centimeters 7 millimeters.
