Young mathematicians learn how to solve problems involving stratified sampling. They review concepts of sampling and proportionality by watching a video and then they complete a worksheet of questions on this topic.

Colby College provides a large collection of exercises on adjectives, adverbs, numbers, prepositions, clauses, study modules, and more.

An incredibly thorough site which consists of many of the major components of the Spanish language. This online test will accurately determine the amount of Spanish you know and need to learn.

Great exercise for practicing the verbs "ser" and "estar" in the present tense. Choose the correct verb conjugations to complete the sentences, and immediately receive the answer and the reason for its use.

Great explanation of Spanish adverbs and how to form "-mente" adverbs from adjectives. Matching, fill-in-the-blank, and multiple choice exercises provide sufficient practice. Answers may be verified after each quiz. Tutorials in other...

[Free Registration/Login Required] This site houses worksheets that have been prepared for both ELL students and students who are learning to speak Spanish as their second language. Most of the worksheets focus on the phonetics of the...

Fantastic quizzes for Spanish speakers. All quizzes feature colorful interface and humorous feedback noises that make learning more enjoyable. Some of the topics are basic phrases, colors, common expressions, describing people,...

This site is provided for by the Colby College. Practice with several different examples of regular and irregular comparisons of adverbs, verbs, nouns, and adjectives. Read the sentences and select the correct comparative. Help is given...

Practice conjugating verbs in this article on the role of women in modern marriage. Fill in the blank with the correct form of the verb in the designated tense: present, present subjunctive, future, preterite, imperfect, or a gerund....

Practice conjugating verbs with this article on domestic violence. Fill in the blank with the correct form of the verb in the designated tense: imperfect subjunctive, preterite, or imperfect. Answers may be checked at the end of the...

Great practice with idioms that use the verb "estar". Also provides practice conjugating the verb in present, preterite, imperfect, future, and conditional tenses--a different practice test for each tense. Answers may be verified after...

This site allows the user to review the uses of the prepositions por and para. After the student reviews the uses, he may practice the uses with the interactive review.