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What is the result of 5.00 - 2.1, considering significant figures?

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Question: What is the result of 5.00 - 2.1, considering significant figures?

Options:

  1. 2.90
  2. 2.9
  3. 2.8
  4. 2.80

Correct Answer: 2.9

Solution: 

When subtracting, the result should be rounded to the least number of decimal places. 5.00 has two decimal places and 2.1 has one, so the result should be rounded to one decimal place: 5.00 - 2.1 = 2.90 becomes 2.9.

What is the result of 5.00 - 2.1, considering significant figures?

Practice Questions

Q1
What is the result of 5.00 - 2.1, considering significant figures?
  1. 2.90
  2. 2.9
  3. 2.8
  4. 2.80

Questions & Step-by-Step Solutions

What is the result of 5.00 - 2.1, considering significant figures?
  • Step 1: Identify the numbers involved in the subtraction: 5.00 and 2.1.
  • Step 2: Determine the number of decimal places in each number. 5.00 has 2 decimal places, and 2.1 has 1 decimal place.
  • Step 3: When subtracting, the result should be rounded to the least number of decimal places from the numbers involved. Here, the least is 1 decimal place (from 2.1).
  • Step 4: Perform the subtraction: 5.00 - 2.1 = 2.90.
  • Step 5: Round the result (2.90) to 1 decimal place, which gives us 2.9.
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