Add Three Addends | Addition and Subtraction within 20

Add Three Addends,  Add & Subtract Within 20 Lesson Workbook   42 Step-by-Step Math Lessons | Special Education Math Intervention | First Grade Math Level   This Three Addend Addition and Addition & Subtraction to 20 lesson workbook includes an example IEP goal, 42 step-by-step math lessons, reviews and assessments. This evidence-based math intervention is tied to first grade standards and is great for special education math goals and tier 2 small group math interventions (RTI).   Three Addends:  This section of the workbook contains lessons on how to add three numbers with sums to 20. Students learn to say the biggest number and count up on the smaller numbers using touch dots.  Adding three numbers is a pre-skill for adding multi-digit numbers with carrying.  These lessons can help prepare your students for adding larger numbers in the future. Teen Numbers Plus or Minus One-Digit Numbers:  These lessons are a continuation of Adding and Subtracting Numbers to 10.  Students