Struggling to teach missing addends without guessing or counting cubes?This resource uses number line strategies, explicit modeling, and guided practice to help students find the unknown addend with confidence. Students learn how to solve missing addend equations within 20 using number lines through teaching videos, task cards, remediation tools, and leveled worksheets. Skills & Concepts Covered Missing addends within 20 Finding the unknown addend Using a number line as a math strategy Und