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https://dealsfinders.blog/190526/amazon-singapore-math-level-4a-math-practice-workbook-for-5th-grade-paperback-ages-10-11-with-answer-key-paperback-just-5-reg-9-99-as-of-9-12-2019-1-36-pm-cdt/
Amazon : Singapore Math – Level 4A Math Practice Workbook for 5th Grade, Paperback, Ages 10–11 with Answer Key Paperback Just $5 (Reg : $9.99) (As of 9/12/2019 1.36 PM CDT)