Take a one-meter rod and mark 4 points on it such that each segment is of equal length.
If we take OA to be X units, then X units is equal to:
20 cm
One meter equals to 100cm. If one-meter is divided into five equal parts, then each part measures
1 m5= 100 cm5 = 20 cm = 200 mm
X units = 20 cm