Practice addition and subtraction within 20 using ten frames, number lines, vertical problems, matching activities, games, puzzles, and true/false challenges — perfect for 1st–2nd grade math practice, centers, or homework! What's Included:1. Ten Frames: Addition & Subtraction (4 pages, 40 problems) 2. Number Lines: Addition & Subtraction (6 pages, 48 problems) 3. Vertical Addition and Subtraction: (10 pages, 120 problems) 4. Fill in the Blanks: Complete missing numbers (2 pages) 5. Matching Acti