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I think it's very difficult to convert the physical length unit into scientific counting method. What method can be simpler
There is no easy way, this part is the most basic content of learning physics - unit conversion
Remember on the basis of understanding
For example, 1km = 1000m, 1mm = 1000 μ m, and 1 μ M = 1000nm are carried by 1000
1 m = 10 DM, 1 DM = 10 cm, 1 cm = 10 mm, these units are 10 carry
In addition, such carry can be used for unit conversion, and then expressed by scientific notation
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