Help your students master missing addends with this complete, ready-to-use math intervention toolkit! Perfect for 1st grade and 2nd grade small groups, RTI Tier 2, or targeted reteaching, this resource builds students’ ability to solve missing addend problems within 20 using visual models, hands-on games, and guided practice. Instead of rote memorization, students will develop number sense, fact fluency, and flexible problem-solving strategies that transfer to addition and subtraction succe