34 cm as it equals 340 mm
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1 cm = 10 mm3.4 cm = (3.4 x 10) = 34 mmSo 3.4 cm is 4 mm bigger than 30 mm.
3.4 cm
I believe you are trying to ask which MEASUREMENT is bigger. There are 10 mm in a cm, so you can multiply 3.4 cm by 10 to get 34 mm; which is bigger.
To compare the sizes of 3.4 cm and 30 mm, we need to convert them to the same unit. Since 1 cm is equal to 10 mm, 3.4 cm is equivalent to 34 mm. Therefore, 30 mm is smaller than 3.4 cm.
34 cm = 340 mm