Which of the following masses is the smallest?

0.006 kilograms
500 milligrams
40 grams
4.2 decigrams

The answer is D. 0.42 decigrams is smaller.

Explanation:

I converted everything to grams, 0.006 kilograms = 6 grams, 500 milligrams = 0.50 grams, 40 grams is 40 grams, and 4.2 decigrams = 0.42 grams.

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