Subtraction as an Unknown Addend Activity

Subtraction as an Unknown Addend Activity This math activity helps students in grades K-2 learn subtraction by finding missing addends in equations. Students start with simple addition and subtraction facts up to 20. As they work through the activity pages, they must apply their understanding of addition/subtraction fact families to find unknown whole numbers. Teachers can use this resource for whole-class instruction, small group remediation, independent practice, or homework. By scaffolding subtraction concepts and repeatedly exposing students to missing addend problems, this activity builds fluency with early number sense and operations. Students will gain confidence with subtraction as they use logic and reasoning strategies to fill in blanks and reveal the underlying relationships within equations. This activity supports standards on understanding addition and subtraction as inverse operations.