🧮 Addition and Subtraction within 100

Master basic addition and subtraction facts with numbers up to 100 using strategies like counting on, part-whole models, and number lines. **What you'll learn:** - Add two-digit and one-digit numbers with and without regrouping - Subtract one-digit and two-digit numbers using mental strategies - Solve simple word problems involving addition and subtraction - Use number lines and ten-frames to visualize calculations - Recognize fact families and inverse operations