35 mm. it equals 3.5 cm which is longer than 3 cm
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Yes 1 cm is 10 mm. Figure out how many mm are in 3 cm (multiplication comes to mind?) Now compare the above value you got with 20 and decide for yourself which is bigger. Try it. You can do it. Good luck!
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
2 cm 3 mm = 23 millimetres
1 cm = 10 mm 2 cm = 20 mm 3 cm = 30 mm . . 9 cm = 90 mm That's more than 77 mm.