Missing Addends to 20 Worksheets Strengthen your students’ addition skills with these engaging Missing Addends to 20 Worksheets! This resource is perfect for helping young learners practice missing numbers to 20, build fluency in missing number addition, and confidently master addition up to 20 in a clear and structured way. Designed for hands-on and digital learning, these missing addend worksheets support students as they solve equations, find the unknown number, and develop