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Printable English math code-breaker game for ages 10+ (Level 10). Focus skill: decimal addition and subtraction. Learners solve each problem, match the exact answer to the code key, and reveal four secret messages. The 3-page PDF contains a colorful cover with Lumi the detective fox, a full-page activity, and a complete answer key. Ideal as a printable enrichment activity and independent practice. Suitable for classrooms, math centers, homeschool, homework, review, and step-by-step reasoning practice. Difficulty: Hard. US Letter, print at 100%.