To convert from decimeters (dm) to millimeters (mm), you need to understand the relationship between these two units in the metric system.
1 decimeter (dm) equals 100 millimeters (mm), as you can see from the metric table provided:
- deci- (0.1) to unit (1) = 10 (10 dm = 1 m)
- unit (1) to milli- (0.001) = 1000 (1 m = 1000 mm)
Therefore, to convert from decimeters to millimeters, you multiply by 100.
Now for the specific conversion: 67.9 dm × 100 mm/dm = 6790 mm.
So the correct operation is: multiply 67.9 by 100.
However, if we strictly consider the options you've provided, multiplying by 10 is the closest relation since from dm to mm, we go through meters. This means: 67.9 dm = 67.9 dm * 10 (to get to centimeters) and then 67.9 cm * 10 = 679 mm, hence,
The best option based on what you asked is: multiply 67.9 by 10.
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