The Critical Thinking Co.™

This colorful 32-page book offers a collection of fun, easy-to-use detective cases for Grades 3-12+. This book—unlike the later books in the series—includes some crime cases that involve...

This colorful 32-page book offers a collection of fun, easy-to-use detective cases for Grades 4-12+. Some cases may be more challenging for younger students, but teachers and parents can always...

This colorful 32-page book offers a collection of fun, easy-to-use detective cases for Grades 4-12+. Some cases may be more challenging for younger students, but teachers and parents can always...

This fun, highly-effective 136-page book teaches students in Grades 4-5 grammar, punctuation, spelling, capitalization, and critical reading in a standards-based thinking approach instead of the...

This fun, highly-effective 160-page book teaches students in Grades 6-8 grammar, punctuation, spelling, capitalization, and critical reading in a standards-based thinking approach instead of the...

This fun, highly-effective 216-page book teaches students in Grades 9-12 grammar, punctuation, spelling, capitalization, and critical reading in a standards-based thinking approach instead of the...

Editor in Chief® Beginning 1 improves students' grammar, punctuation, spelling, capitalization, and attention to detail using a standards-based thinking approach rather than drill and practice...

This 48-page book contains several of our best-selling deductive thinking puzzles. It develops the logic, reading comprehension, and mental organization skills vital to achieving higher grades and...

This engaging, colorful 152-page book teaches the most important critical thinking concepts every student should know. Many workbooks claim to teach or develop critical thinking skills, but most of...

This 112-page book teaches students the meaning and spelling of roots, prefixes, and suffixes that are the elements used to form words in English. Learning these word elements dramatically improves...

This 249-page book teaches students the meaning and spelling of Latin roots, prefixes, and suffixes that are the elements used to form words in English. Learning these word elements dramatically...

This 256-page book teaches students the meaning and spelling of Latin and Greek roots, prefixes, and suffixes that are the elements used to form words in English. Learning these word elements...

This 288-page book teaches students the meaning and spelling of Greek roots, Latin and Greek prefixes, and Latin and Greek suffixes that are the elements used to form words in English. Learning these...