Practice pronoun agreement by correcting the pronoun usage errors in each of these 20 sentences.

This site offers two proofreading exercises in which students proofread for errors in spelling, capitalization, punctuation, and usage, and then retype passages correctly. When finished they click Answers for feedback.

This task deals with a student error that may occur where students misinterpret function notation. Aligns with F-IF.A.1.

In this task, 6th graders must inches to feet in order to find the area of a rectangular board and explain the error in the calculations made by the board owner. Aligns with 6.RP.A.3.

Clear up the confusion of troublesome grammar mistakes with these quizzes on correct grammar usage. Includes word choices and verb selection.

Recommended steps to try when troubleshooting any software or hardware related issue. All of these steps are a great way to begin troubleshooting and/or to try when other solutions have not resolved your issue. When trying these steps,...

This article provides an overview of Taxation and Deadweight Loss. When a tax is imposed on a market it will reduce the quantity that will be sold in the market. Whenever the quantity sold in the market is not the equilibrium quantity,...

This site has examples of some common mistakes when forming questions using the present simple verb tense. The correct form is given along with some of the more common errors.

An algebra "cheat sheet" to use as a reference when completing algebra homework. Lists basic facts, properties, operations, formulas, and functions, as well as common errors.

This site from the Washington State University is designed to inform the reader of the most common errors regarding the use of parentheses.

Science fiction author John E. Stith's guidelines for manuscript format, plus some warnings about common errors. This describes the standard format used to send material to a publisher and may not match what your teacher requires.

Dozens of statistical terms are defined and illustrated in this glossary.

This section of the WriteSite includes answers to some common grammatical questions, exercises to help you gain the knowledge to answer them yourself, and information about a program that can show you what kind of errors give you the...

An easy-to-use grammar resource containing rules for style, usage, capitalization, abbreviations, punctuation, and letter writing. This site also includes a glossary of common grammatical mistakes.

This lesson discusses common logical fallacies.

Paul Brians, Professor of English, addresses the problem of using "they" and "their" singular pronouns.

This GrammarCheck infographic provides tips for fixing common writing mistakes. Information on errors related to homophones, apostrophes, commas, participles, and sentence structure are included.

This lab exercise exposes students to a potentially new alternative energy source-hydrogen gas. Student teams are given a hydrogen generator and an oxygen generator. They balance the chemical equation for the combustion of hydrogen gas...

Learn to analyze examples of claims presented in the media that involve estimating a population proportion and population mean.

A vast number of self-study quizzes on homonyms especially designed for English language learners. Using self-scoring drill-and-practice exercises, the Internet TESL Journal helps learners avoid common word-usage errors.

Sections include parts of speech, sentence elements, punctuation, and word use. Also includes a "brief explanations of common writing errors." The tutorials also include interactive quizzes to check your understanding.

This infographic is provided to help alert students about common writing mistakes. The following types of errors are discussed: commas, verb tenses, subject-verb agreement, apostrophes, pronouns, and prepositions.

Rules and examples of commonly made usage errors with a colon.

The most basic quadratic is y = x2. The general technique for graphing quadratics is the same as for graphing linear equations. The quadratics graph as curvy lines (called "parabolas"), rather than the straight lines generated by linear...