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- Decimals
- Place value
- Comparing and ordering decimals
- Rounding to a place
- Significant figures
- Standard form and engineering notation
- Adding decimals
- Subtracting decimals
- Multiplying decimals
- Dividing decimals
- Converting decimals to fractions
- Converting decimals to percents
- Converting between decimals, fractions and percents
- Ordering decimals, fractions and percents

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- Understanding fractions
- Simplifying (reducing) fractions
- Equivalent fractions
- Comparing fractions
- Ordering fractions
- Mixed numbers and improper fractions
- Adding fractions
- Subtracting fractions
- Adding and subtracting mixed numbers
- Multiplying fractions
- Dividing fractions
- Multiplying and dividing mixed numbers
- Converting fractions to decimals
- Converting fractions to percents
- Converting between fractions, decimals and percents
- Ordering fractions, decimals and percents

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In this module, you can study what a significant figure is and how to round numbers to a significant figure.

The video above explains what significant figures are and how to find them in a number.

The video above shows you how to round to a significant figure.

The number of significant figures in a number is not necessarily the same as the number of decimal places. The number ".1503" has four significant figures, while this number ".00932" has only three.

- Read about significant figures and roundingRead about significant figures (called significant digits on this website) and rounding at purplemath.com.
- Download a significant figure workhseetDesign and print a worksheet for identifying significant figures at math-aids.com.
- Quiz yourself on significant figuresQuiz yourself on significant figures with this fifteen-question quiz.

Use these search terms to find additional resources:

*significant figuresignificant digitround to significant figure*