12 meters is how many millimeters?

Answer 1

1.2m = 120cm

there are 10mm in a cm, so

120x10 = 1200mm

There are 1200mm in 1.2 meters

+++

You don't need the middle step in the first answer. The prefix in the metric system is the direct multiplier or divider for the conversion. Here, as 'milli' means thousandths, we simply multiply the metres by 1000 to find the millimetres. Breaking the conversion into two or more steps, unless it really is an unwieldy size, increases the chance of error as well as being needless extra work.

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If you are wondering about my spelling of 'metre', it is a French word!

Answer 2

12 millimeters is 0.012 meters.

Answer 3

12,000 mm