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# Significant Figures and Significant Digits

Learning significant figures can be difficult in science. But, there is a reason to learn them. Scientists and engineers use significant figures to show how accurate their measurements are and how accurate the instruments used to collect the measurements are.

Click the link to watch "Significant Figures and Significant Digits - The Rules" on YouTube:

http://youtu.be/hHdQ4z6Sm1s

The Rules of Significant Figures

1. Non-zero numbers are always significant

2. Any "trapped" zeros between two significant figures are significant

3. Any trailing zeros are significant only if there is a decimal in the number

Operation Rules for Significant Figures

1. When adding or subtracting: Answer is limited to the fewest number of significant figures after the decimal.

2. When multiplying or dividing: Answer limited to fewest number of significant figures in any number in the problem

Watch the video for examples of how to count, add, subtract, multiply and divide using significant figures.

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