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The only thing to know is: 1 c(enti)m(eter) equals to 10 m(illi)m(eter) because

  • 1 cm = 1/100 m and
  • 1mm = 1/1000 m

9,1 cm = 9,1 * (10 mm) = 9,1 * 10 mm = 91 mm

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15y ago

What else can I help you with?