Question

1. explain how to round answers to the correct number of significant figures when adding or subtracting. 12. explain how to round answer to the correct number of significant figures when multiplying or dividing.

Explanation:

1. When adding or subtracting, round the answer to the same number of decimal places as the measurement with the fewest decimal places among the values being added or subtracted. This is because the uncertainty in the least - precise measurement in terms of decimal places dominates the result.
2. When multiplying or dividing, round the answer to the same number of significant figures as the measurement with the fewest significant figures among the values being multiplied or divided. This is to maintain the appropriate level of precision based on the least - precise value in terms of significant figures.

Answer:

1. When adding or subtracting, round to the least number of decimal places of the values involved.
2. When multiplying or dividing, round to the least number of significant figures of the values involved.