Reference
Quick-lookup sheets for the formulas, symbols, units and conventions that come up in class, grouped by subject and searchable in English or Spanish.
Math & Science
4 GuidesMath Formula Reference
The algebra, geometry, trigonometry, and statistics formulas students look up most, written out cleanly.Quick ReferenceRoman Numerals & Greek Alphabet
What each Roman numeral is worth and how they combine, plus the full Greek alphabet and where each letter shows up.Quick ReferencePeriodic Table Reference
All 118 elements in an interactive table you can zoom and filter by type or state, with each element's mass, electron configuration and properties.Quick ReferenceUnit Conversion Chart
Metric prefixes and the everyday length, mass, volume, area, speed, and temperature conversions, with exact factors marked.Quick Reference
Writing & Research
2 GuidesLatin Phrases & Academic Abbreviations
What e.g., i.e., et al., and the other Latin and academic abbreviations in your reading mean, and how to use them correctly.Quick ReferenceCitation Style Quick Guide (MLA & APA)
The patterns for MLA 9 and APA 7: in-text citations and full entries for books, websites, and journal articles.Quick Reference
College & Career
2 GuidesSchool Term Systems Explained
How semesters, trimesters, and quarters divide the school year, and what the School Term System setting changes here.Quick ReferenceMajors to Careers Quick Reference
Common career paths for popular majors, what a skills gap is, and how to close one while you are still in school.Quick Reference
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