Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Significant Digits
Find a quick, concise explanation of significant digits. An example is given and clearly explained.
CK-12 Foundation
Ck 12: Algebra: Scientific Notation
[Free Registration/Login may be required to access all resource tools.] Write whole numbers and decimals in scientific notation; apply the rules of exponents to evaluate scientific notation expressions and determine the number of...
Other
Dan's Math: Basic Skills Topics
College professor Dan Bach offers a review of various basic topics in arithmetic, pre-algebra, and algebra. Order of operations, exponents, square roots, variables, and combining terms are just a few of the many topics covered.
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!