To determine which pair of numbers shows that the second number is an estimation of the first, we can look at how close the second number is to the first in terms of magnitude or rounding.
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0.00345, 0.004 - Here, 0.004 is a reasonable estimation of 0.00345, as it rounds 0.00345 to three decimal places (thousandths place).
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275, 200 - In this case, 200 is not a close estimation of 275. It's quite different in value.
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0.00345, 0.003 - Here, 0.003 is lower and doesn't reflect a proper estimation of 0.00345, considering they are both in the same order of magnitude.
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345, 400 - The number 400 is not a close estimation of 345; it is significantly higher.
Based on this analysis, the best option is 0.00345, 0.004, where 0.004 is a reasonable estimate of 0.00345.
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