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2  \n7) 1 9 - 4  \n11) 1 5 - 3  \n15) 1 9 - 7  \n19) 2 0 -1 0  \n4) 9 + 5  \n8) 1 3 + 7  \n12) 1 0 + 7  \n16) 4 + 2  \n20) 1 6 + 4  \nAnswers  \n1.  \n2.  \n3.  \n4.  \n5.  \n6.  \n7.  \n8.  \n9.  \n10.  \n11.  \n12.  \n13.  \n14.  \n15.  \n16.  \n17.  \n18.  \n19.  \n20.  \nMath  \n[www.CommonCoreSheets.com](www.CommonCoreSheets.com)  \n8  \n1-10 11-20  \n95  \n45  \n90  \n40  \n85  \n35  \n80  \n30  \n75  \n25  \n70  \n20  \n65  \n15  \n60  \n10  \n55  \n5  \n50  \n0  \nAdding and Subtracting within 20  \nName: Answer Key  \nSolve each problem.  \n1) 1 9 2)- 3  \n1 6  \n5) 2 0 6)- 8  \n1 2  \n9) 9 10)-3  \n6  \n13) 1 7 14)  \n- 3  \n1 4  \n17) 5 18)  \n-2  \n3  \n1 8 + 2  \n2 0  \n7  \n+ 1  \n8  \n4  \n+ 3  \n7  \n1 2 + 1  \n1 3  \n1 0 + 5  \n1 5  \n3) 1 8 - 2  \n1 6  \n7) 1 9  \n- 4  \n1 5  \n11) 1 5  \n- 3  \n1 2  \n15) 1 9  \n- 7  \n1 2  \n19) 2 0  \n-1 0  \n1 0  \n4)  \n9  \n+ 5  \n1 4  \n8) 1 3 + 7  \n2 0  \n12) 1 0  \n+ 7  \n1 7  \n16) 4  \n+ 2  \n6  \n20) 1 6 + 4  \n2 0  \nAnswers  \n1. 16 2. 20 3. 16 4. 14 5. 12 6. 8 7. 15 8. 20 9. 6 10. 7 11. 12 12. 17 13. 14 14. 13 15. 12 16. 6 17. 3 18. 15 19. 10  \n20. 20  \nMath  \n[www.CommonCoreSheets.com](www.CommonCoreSheets.com)  \n8  \n1-10 11-20  \n95  \n45  \n90  \n40  \n85  \n35  \n80  \n30  \n75  \n25  \n70  \n20  \n65  \n15  \n60  \n10  \n55  \n5  \n50  \n0  \nAdding and Subtracting within 20  \nName:  \n\n| Solve each problem. |  |  |  |  |  |  |  |  | Answers\u003Cbr>1.  \u003Cbr>2.  \u003Cbr>3.  \u003Cbr>4.  \u003Cbr>5.  \u003Cbr>6.  \u003Cbr>7.  \u003Cbr>8.  \u003Cbr>9.  \u003Cbr>10.  \u003Cbr>11.  \u003Cbr>12.   |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| \u003Cbr>15 7 20 12\u003Cbr>20 16 16 12\u003Cbr>14 17 8 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n| 1) 1 9 2) 1 8 3) 1 8 4) 9\u003Cbr>- 3  + 2  - 2   + 5 \u003Cbr>5) 2 0 6) 7 7) 1 9 8) 1 3\u003Cbr>- 8  + 1  - 4  + 7 \u003Cbr>9) 9 10) 4 11) 1 5 12) 1 0\u003Cbr>-3  + 3  - 3  + 7  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n| \u003Cbr>Math | Modified\u003Cbr>[www.CommonCoreSheets.com](www.CommonCoreSheets.com) | 8 | 1-10\u003Cbr>11-12 | 92 | 83 | 75 | 67 |  | 58 | 50 | 42 | 33 | 25 | 17 |\n|  |  |  |  | 8 | 0 |  |  |  |  |  |  |  |  |  |","cbCaicFNVfD9teOo","https://ap.wps.com/l/cbCaicFNVfD9teOo","pdf",46657,"English","# Solve each problem\n## Answers","[{\"question\":\"What math skills does this worksheet practice?\",\"answer\":\"It practices addition and subtraction using numbers within 20, with problems involving two-digit and one-digit operations.\"},{\"question\":\"How are the problems presented?\",\"answer\":\"Each item is a standalone number sentence (e.g., subtraction like 19 - 4, addition like 13 + 7) labeled with a problem number.\"},{\"question\":\"Where can I check the answers?\",\"answer\":\"The document includes an “Answers” section that lists the correct results for problems 1 through 20.\"}]","Adding and Subtracting within 20 - Worksheet Answer Key | PDF"]