231 mm is 9.1 inches.
1 inch= 25.4mm so 231 ÷ 25.4 = 9.094 inches (to 3dp)
231 inches = 19 feet 3 inches.
231 inches = 19.25 feet.
231/36 = 6.416 yards
210 mm = 8.26772 inches. 1 mm is 0.0393701 inches.
multiply inches by 25.4 = mm divide mm by 25.4 = inches
91.44 mm = 3.6 inches
269 mm = 10.59 inches
437 mm is 17.2047 inches.
There are about 26 inches in 655 mm
4.3 mm = about 0.169 inches.
420 mm = 16.5 inches