What is 0.4 cm on a ruler?
4 mm 4 mm (0.4 cm) 5 mm (0.5 or 1/2 cm) 6 mm (0.6 cm) 7 mm (0.7 cm)
What is 0.5 cm on a ruler?
Halfway between each centimeter, there is a slightly shorter line that denotes 1/2 of a centimeter, or 0.5cm. There are a total of 60 of these marks on a 30 cm ruler. For example, you measure a button and the edge ends on the fifth line right between the 1 and 2 centimeter marks. Your button is 1.5cm long.
What is the actual size of 3mm?
3mm = almost 1/8 inch. 4mm = 5/32 inch (= a bit over 1/8 inch) 5mm = just over 3/16 inch. 6mm = almost 1/4 inch.