Oh, dude, 3 mm is like 0.3 cm because there are 10 mm in 1 cm. So, if you want it in fractions, it's like 3/10. But hey, who's counting, right?
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10 mm = 1 cm 20 mm = 2 cm 30 mm = 3 cm . . 70 mm = 7 cm
1 cm = 10 mm ⇒ 3 cm = 3 x 10 mm = 30 mm
14 mm/3 cm = 14 mm/30 mm = 14/30 = 7/15
10 mm = 1 cm 20 mm = 2 cm 30 mm = 3 cm . . etc.
1 cm = 10 mm 2 cm = 20 mm 3 cm = 30 mm . . 9 cm = 90 mm That's more than 77 mm.