It is: 1/10
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To convert 10 cm to mm, we need to multiply by 10 (since 1 cm = 10 mm). So, 10 cm is equal to 100 mm. Adding the 2 mm gives us a total of 102 mm. Therefore, the fraction for 10 cm and 2 mm is 102/10, which simplifies to 51/5.
cm is bigger than mm, so yo're going to have a fraction. 7mm=0.7cm therefore, there is 0.7cm in a mm
14 mm/3 cm = 14 mm/30 mm = 14/30 = 7/15
20 mm / 40 cm = 2 cm / 40 cm = 2/40 = 1/20 or 0.05
Seeing as there are 100 mm in a centimetre, there are 1/100.