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Leonid Trostanetsky

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Star of the Seven Seas: Math Word Problems and Their Solutions Step-by-Step for Grades 1-3 (Math and Science Enrichment for Kids)
Speed Math and Math Magic for Kids - Easy Times Tables, Fun Math Tricks, and Mental Cheat Sheets (Math and Science Enrichment for Kids)
Star of the Seven Seas Math Word Problems and Their Solutions Step-by-Step for Grades 1-3
3-Minute Science: a Reader for Kids Physics and Chemistry Are All Around Us!