1 centimeter (cm) = 0.01 m 1 millimeter (mm) = 0.1 cm 1 micrometer or micron (um or u) = 0.001 mm 1 nanometer (nm) = 0.001 m 5. Use the list above to help you to fill in the blanks. 1 mm = 1.5 mm = 0.25 mm = 0.25 m = m um um nm 1 m = 1.5 m = 0.25 m = 20 nm = mm mm mm um