Build strong addition skills with this comprehensive 2-Digit by 1-Digit Addition Worksheets set—designed to support accuracy, place-value understanding, and standard algorithm fluency. This resource includes both With Regrouping and Without Regrouping practice, making it perfect for differentiated instruction in Grades 1–3. Students practice adding 2-digit numbers and 1-digit numbers within 100, using clear vertical formats that strengthen understanding of tens & ones, regrouping, an