3.4 cm equals 34 mm which is greater than 30 mm
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1 meter = 100 cm = 1000 mm there are 10 mm in 1cm so 300 mm = 30 cm. greater
1 cm = 10 mm so 34 cm = 34*10 = 340 mm. Simple!
6 cm is greater than 50 mm which equals 5 cm
90 cm is greater than 9 mm
800 cm (1 meter/100 cm) = 8 meters1000 mm (1 meter/1000 mm) = 1 meter800 cm is much greater than 1000 mm