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Mixed first-grade addition and subtraction within 20, with an answer key.
A mixed practice worksheet combining addition and subtraction within 20 for first graders. Switching between operations helps children build flexible thinking. An answer key is included.
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.