Help your pre-primary students understand addition within 1-20 and fill in the answer with these worksheets! These worksheets provide your students with math missing addends practice, and they begin to develop the concept of addition. With this set of 9 introductions (108 questions) to addition and matching missing addends practice pages, you will help your students develop foundational skills as they work on addition. These simple missing addend matching worksheets are the perfect addition to a