Everything you wanted to know about calculus—and more! The resource is a complete Calculus textbook with explanations, examples, and practice problems. 

This proofreading exercise asks students to read sentences and using the drop-down menu to select the correct choice for the blank. These sentences cover capitalization, punctuation, spelling, and usage.

This lesson focuses on the characteristics of a circle including similarity, radius, circumference, and Pi. It provides formulas to determine the area of a circle, calculating Pi, and learning exercises throughout.

This lesson focuses on arithmetic and geometric sequences using several examples and practice exercises.

Excellent examples given in Spanish for the uses of por and para.

In this activity, students are to read the sentence, and select the complete verb phrase from the options given in an arrow-down box. Java is required.

An interactive exercise where students read two sentences and then choose the conjunction that would best join them together. Correct answers are provided for any missed, and score is kept throughout the exercise.

This is a 15-question exercise/assessment for homonyms; students select the correct word from the homonyms in the box that fits the sentence.

Learn how we can keep our respiratory system healthy.

This activity helps students improve their understanding of sequencing by putting seven actions in sequential order.