Curated OER
Rationalizing Denominators with Radicals
In this radicals activity, learners solve 10 different problems that include rationalizing the denominators in each problem. First, they rationalize the denominator. Then, students write the conjugate for each binomial. In addition, they...
Curated OER
Complex Analysis: Complex Numbers
In this complex numbers instructional activity, students compute the value of given expressions and write the answer in complex number form. This one-page instructional activity contains three equations.
Curated OER
Complex Analysis: Properties of Complex Numbers
In this properties of complex numbers worksheet, students list and explain the properties and operations used to compute the value of expressions. This one-page worksheet contains six definition questions and three equations.
Languages Online
Languages Online: The Future Tense
A great explanation of how to conjugate the future tense introduces six exercises that practice regular and irregular verbs. The "vosotros" form is also used. One exercise involves converting the verbs from present tense to future, and...
Other
La Conjugacion De Verbos en Espanol
Get verb conjugation help here with multiple "AR, ER and IR" verbs to work with. Use the site to learn how each of these verbs are conjugated in different tenses.
Other
Conjugate Spanish Verbs Online
This is one of the best online resources available for the Spanish teacher and student. This site offers a verb conjugation tool. Enter the verb and click "Conjugate," and everything from the present tense to the subjunctive tense is...
Languages Online
Languages Online: Si Clauses + Conditional Tense
This exercise-practice the teaches students how to write imperfect subjunctive and the conditional tense used in Spanish "if-would" clauses. Fill in the blank with the conditional or past subjunctive form of the verb. Answers may be...
Languages Online
Languages Online: El Condicional
A great explanation of the conditional tense introduces one matching, and five gap-fill exercises that provide plenty of practice with regular and irregular conjugations. The "vosotros" form is also used. A great way for students to...
Languages Online
Languages Online: El Imperfecto
A great explanation of the imperfect tense introduces thirteen multiple choice, matching, and gap-fill exercises that provide plenty of practice with regular and irregular conjugations. The "vosotros" form is also used. A great way for...
Colby College
Spanish Language & Culture: Verbs Conjugated Like Gustar
Practice utilizing verbs in an online exercise that have the same grammatical format as the verb "gustar". Indirect object pronouns are also part of this exercise. Colby College Site.
Colby College
Spanish Language & Culture: Saber and Conocer (Part 1)
Great exercise for practicing the use of "saber" and "conocer." Type in the appropriate form of either verb for each sentence. Clicking on the question mark will provide the correct answers.
Khan Academy
Khan Academy: Relationship Between Ka and Kb
Learn about the relationship between Ka of a weak acid and Kb for its conjugate base. Practice equations for converting between Ka and Kb, and converting between pKa and pKb.
Texas A&M University
Wtamu Virtual Math Lab: College Algebra: Complex Numbers
Use this tutorial to learn what imaginary and complex numbers are, how to write them, and how to perform operations with them. Offers step-by-step examples, video explanations of the examples, and practice questions with answers.
Paul Dawkins
Paul's Online Notes: Algebra: Preliminaries: Complex Numbers
This math tutorial features notes and examples that illustrate complex numbers including standard form, adding, subtracting, multiplying and dividing them.
Purple Math
Purplemath: Conics: Hyperbolas
A three-part tutorial that discusses the basic terms, definitions, and formulas related to hyperbolas.
Purple Math
Purplemath: Complex Numbers: Introduction
This website provides an in-depth lesson on complex numbers. You learn about simplifying, adding, and multiplying complex numbers by viewing example problems that are worked through step-by-step. Continue on to pages 2 and 3 which...
Wolfram Research
Wolfram Math World: Complex Conjugate
This site contains an explanation of complex conjugates. Then it goes on to list and display charts and formulas. Links are also provided for additional information.
Open Curriculum
Open Curriculum: Conjugate Acid Base Pairs
The objective of this article is to introduce conjugate pairs as a way to relate acids and bases.
Languages Online
Languages Online: Imperfect Subjunctive Ra Ending
This exercise-practice the teaches students how to write imperfect subjunctive endings for regular and irregular Spanish verbs. Immediate feedback is available to check answers. Tutorials in other langauges available from the homepage.
Languages Online
Languages Online: Imperfect Subjunctive Ra Endings
This exercise-practice teaches students how to properly write the imperfect subjunctive endings for regular and irregular Spanish verbs. Fill in the blank with the correct form of the past subjunctive and check your answers when you...
BusinessSpanish.com
Business Spanish: Ser & Estar: To Be
The perfect resource for making sense out of the two trickiest verbs in Spanish. This site does an excellent job at explaining, providing details and showing ser and estar conjugations.
University of Waterloo (Canada)
Univ. Of Waterloo: Conjugate Acid Base Pairs
This page, created by a chemistry professor from the University of Waterloo, provides an introduction to conjugate acid-base pairs.
University of Waterloo (Canada)
Univ. Of Waterloo: Conjugate Acids of Bases
This site, created by a University of Waterloo Chemistry professor, applies conjugate pair theory. It also deals with the ionization constants for acids and bases.
Other
Spanish Verb Conjugation: Preterite
A great tool to practice verb conjugations in the preterite tense. The student may choose the type of verb (regular, irregular, etc.) that needs to be drilled. As each answer is entered, the student receives immediate feedback on the...