5 cm X 10 mm/cm = 50 mm
2 cm X 10 mm/cm = 20 mm
50 mm - 20 mm = 30 mm
The answer is 30 mm.
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Millimeters may be appropriate, or perhaps centimeters. If a fish is 63 mm long, then it would be 6.3 cm long. U have to take the fish out of the aquarium
A kilometer has 100,000 centimeters. Answer: 240,000 cm
That refers to the marks - for example, a ruler may be marked with centimeters and millimeters. The centimeter marks are somewhat longer (to distinguish them easily); the millimeter marks are usually the smallest division - the smallest unit that is marked on the scale.
It cannot have more than one.
1 in = 2.54 centimeters