Firefly & Fern

Ages 9–12language learningenglish acquisition

Ages 8–10language learningenglish acquisition

Ages 15–18grammarlanguage skills

Smith

Ages 12–15mathematicsproblem-solving

Scholastic Inc.

Ages 6–12learningproblem-solving

Ken Dobson

Ages 12–15science learningacademic support

Ages 9–12problem-solvinglearning tools

Anne Zeman, Kate Kelly

Ages 8–14learningscience

Ages 14–18learningreference

James R. Ogden, Research & Education Association, Rea

Ages 12–18mathematicslearning