This 150 page printable PDF file includes: 1. Single digit adding 2. Double digit adding 3. Triple digit adding 4. Four digit adding 5. Missing Addends 6. Column Addition 7. Horizontal Addition 8. Addition with and without regrouping 9. Word Problems These worksheets have many uses: 1. Home school 2. Substitute teacher 3. Snow days 4. Busy work 5. Online distance learning 6. Class work 7. Independent work 8. Warm up activity 9. Homework 10. Quizzes 11. End of quarter review 12. End of year revie