Big Math Workbook Vol 3: Add, Subtract & Multiply: 2 3 Digit Regrouping Practice and Basic Multiplication for Kids

Subtract with Power: 3‑Digit Math for Growing Learners: Vertical Subtraction and Regrouping Practice

Regrouping addition math practice tests: For kids and teenagers using 2 digit 3 numbers

Multiplication Workbook for Kids: 1-Digit, 2-Digit & 3-Digit Practice Timed Drills, and Skill-Building Worksheets