Converting between different units in the metric system (like grams to kilograms or meters to kilometers) is a fundamental math skill. It relies entirely on understanding how to divide by 1000 and shift the decimal point.
In mathematics, trailing zeros after a decimal point don't change the value. Writing 0.19 kg is mathematically exactly the same as writing 0.190 kg.
If you were doing the reverse (converting Kilograms to Grams), you would Multiply by 1000 and shift the decimal point three steps to the right.
190 grams is equal to 0.190 kilograms (or simply 0.19 kg).
You divide 5 by 1000. Move the decimal 3 steps left. Because there are no numbers, you add zeros: 0.005 kg.
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