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0.4

The reasoning: 400 divided by 1000 is 0.4. The significant figures given in both your numbers was 1 (although it could have been more as you didn't use scientific notation so it is not possible to tell). 1 significant figure means the same should be used in the answer: 0.4. And in scientific notation:

4E-1

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12y ago

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Q: How do you write 400 out of 1000 in decimal form?
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