Top site for "variable": dictionary.reference.com
Description: Free online dictionary search, translator, word of the day, crossword puzzles and word games, and vocabulary learning resources for many languages.
Approx. monthly SE traffic: 117.22M
Approx. monthly SE traffic cost equivalent: $103.99M
Broad Searches: 6.12M
Niche value (searches * cpc): $178.28K
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Purplemath contains practical algebra lessons demonstrating useful techniques and pointing out common errors. Lessons are written with the struggling student in mind, and stress the practicalites over the technicalities. Links and other resources also available.
Positions count: 10.02K
W3schools.com: W3Schools Online Web Tutorials
Positions count: 40.30K