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Singapore Math 2nd Grade Math Workbook, Addition, Subtraction, Multiplication and More for Homeschool or Classroom (Singapore Math, Level 1 A & B)Humble Math – Measurement Basics: (With Answer Key) U.S. Customary & Metric System Measuring Book | Learn to Measure | Unit Conversions | Metric … Workbook – 100 Practice Pages (Ages 9+)