Answer:
To determine which pair of numbers shows the second number as an estimation of the first, we can compare the values and determine if the second number is a close approximation of the first number.
Let's evaluate each pair of numbers:
1. 0.00345; 0.003: The second number (0.003) is a close approximation of the first number (0.00345). Therefore, this pair shows the second number as an estimation of the first.
2. 345; 400: The second number (400) is not a close approximation of the first number (345). Therefore, this pair does not show the second number as an estimation of the first.
3. 275; 200: The second number (200) is not a close approximation of the first number (275). Therefore, this pair does not show the second number as an estimation of the first.
4. 0.00345; 0.004: The second number (0.004) is not a close approximation of the first number (0.00345). Therefore, this pair does not show the second number as an estimation of the first.
Based on the evaluation, the pair "0.00345; 0.003" shows the second number as an estimation of the first.