Texas Education Agency
Texas Gateway: Significant Figures
Given quantitative data, students will express and manipulate quantities using the correct number of significant figures.
Purple Math
Purplemath: Rounding and Significant Digits
Explains how to round to a given number of "significant digits".
Other
Wittenberg University: Major Figures of the Harlem Renaissance
Brief overview, followed by biographical sketches of people making this time memorable.
CK-12 Foundation
Ck 12: Unit Conversions, Error, and Uncertainty
[Free Registration/Login may be required to access all resource tools.] Students explore a science investigation learning module including conversions, error, and uncertainty in scientific measurement.
Math Is Fun
Math Is Fun: Approximate Solutions
Sometimes it is difficult to solve an equation exactly. But an approximate answer may be good enough!