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First-grade addition worksheet with problems within 20 and a full answer key.
This first-grade math worksheet focuses on addition within 20, an important early skill. With sixteen problems and a clear answer key, it's ideal for homework or classroom practice.
Click "Download PDF" to save the worksheet, or "Open & Print" to print it directly. Each worksheet includes an answer key on the last page for easy grading. Want unlimited practice on screen? Try our free interactive Math Practice tool, which generates new problems every time.