Significant Figures: In Calculations Video Lessons

Concept: Significant Figure Rules with Multiplication and Division.

# Problem: A calculator is used to add and subtract measured masses: 43 g + 1.00 g - 2.008 g = 41.992 g What should the numeric answer be when expressed to the correct number of significant figures?

###### FREE Expert Solution

Establish the rules in operations and significant figures and apply them to the given calculation:

43 g + 1.00 g - 2.008 g = 41.992 g

Remember the rules for the significant figures in calculations.

1. For multiplication and division, measurement with the least number of significant figures shall determine the final answer.

Example:

2.55 x 5.2 = 13.26

→ since 5.4 has the least significant figures of 2 (2.55 has three), the answer would be rounded up to 13 to retain the significant figures.

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###### Problem Details

A calculator is used to add and subtract measured masses: 43 g + 1.00 g - 2.008 g = 41.992 g What should the numeric answer be when expressed to the correct number of significant figures?