【20以内的加减法口诀心算表】在小学数学学习中，20以内的加减法是基础中的基础。掌握这些基本运算不仅能提高计算速度，还能为后续的数学学习打下坚实的基础。为了帮助孩子们更好地记忆和运用这些口诀，以下是一份简洁明了的“20以内的加减法口诀心算表”，结合与表格展示，便于理解和复习。
一、加法口诀（1~20）
加法是将两个数合并成一个总数的运算。20以内的加法口诀可以帮助孩子快速完成心算。以下是常见的加法口诀：
| 加数 | 另一个加数 | 和 |
| 1 | 1 | 2 |
| 1 | 2 | 3 |
| 1 | 3 | 4 |
| 1 | 4 | 5 |
| 1 | 5 | 6 |
| 1 | 6 | 7 |
| 1 | 7 | 8 |
| 1 | 8 | 9 |
| 1 | 9 | 10 |
| 1 | 10 | 11 |
| 2 | 2 | 4 |
| 2 | 3 | 5 |
| 2 | 4 | 6 |
| 2 | 5 | 7 |
| 2 | 6 | 8 |
| 2 | 7 | 9 |
| 2 | 8 | 10 |
| 2 | 9 | 11 |
| 2 | 10 | 12 |
| 3 | 3 | 6 |
| 3 | 4 | 7 |
| 3 | 5 | 8 |
| 3 | 6 | 9 |
| 3 | 7 | 10 |
| 3 | 8 | 11 |
| 3 | 9 | 12 |
| 3 | 10 | 13 |
| 4 | 4 | 8 |
| 4 | 5 | 9 |
| 4 | 6 | 10 |
| 4 | 7 | 11 |
| 4 | 8 | 12 |
| 4 | 9 | 13 |
| 4 | 10 | 14 |
| 5 | 5 | 10 |
| 5 | 6 | 11 |
| 5 | 7 | 12 |
| 5 | 8 | 13 |
| 5 | 9 | 14 |
| 5 | 10 | 15 |
| 6 | 6 | 12 |
| 6 | 7 | 13 |
| 6 | 8 | 14 |
| 6 | 9 | 15 |
| 6 | 10 | 16 |
| 7 | 7 | 14 |
| 7 | 8 | 15 |
| 7 | 9 | 16 |
| 7 | 10 | 17 |
| 8 | 8 | 16 |
| 8 | 9 | 17 |
| 8 | 10 | 18 |
| 9 | 9 | 18 |
| 9 | 10 | 19 |
| 10 | 10 | 20 |
二、减法口诀（1~20）
减法是已知总数和一个加数，求另一个加数的运算。掌握减法口诀同样有助于提升心算能力。以下是常见的减法口诀：
| 被减数 | 减数 | 差 |
| 2 | 1 | 1 |
| 3 | 1 | 2 |
| 3 | 2 | 1 |
| 4 | 1 | 3 |
| 4 | 2 | 2 |
| 4 | 3 | 1 |
| 5 | 1 | 4 |
| 5 | 2 | 3 |
| 5 | 3 | 2 |
| 5 | 4 | 1 |
| 6 | 1 | 5 |
| 6 | 2 | 4 |
| 6 | 3 | 3 |
| 6 | 4 | 2 |
| 6 | 5 | 1 |
| 7 | 1 | 6 |
| 7 | 2 | 5 |
| 7 | 3 | 4 |
| 7 | 4 | 3 |
| 7 | 5 | 2 |
| 7 | 6 | 1 |
| 8 | 1 | 7 |
| 8 | 2 | 6 |
| 8 | 3 | 5 |
| 8 | 4 | 4 |
| 8 | 5 | 3 |
| 8 | 6 | 2 |
| 8 | 7 | 1 |
| 9 | 1 | 8 |
| 9 | 2 | 7 |
| 9 | 3 | 6 |
| 9 | 4 | 5 |
| 9 | 5 | 4 |
| 9 | 6 | 3 |
| 9 | 7 | 2 |
| 9 | 8 | 1 |
| 10 | 1 | 9 |
| 10 | 2 | 8 |
| 10 | 3 | 7 |
| 10 | 4 | 6 |
| 10 | 5 | 5 |
| 10 | 6 | 4 |
| 10 | 7 | 3 |
| 10 | 8 | 2 |
| 10 | 9 | 1 |
| 11 | 1 | 10 |
| 11 | 2 | 9 |
| 11 | 3 | 8 |
| 11 | 4 | 7 |
| 11 | 5 | 6 |
| 11 | 6 | 5 |
| 11 | 7 | 4 |
| 11 | 8 | 3 |
| 11 | 9 | 2 |
| 11 | 10 | 1 |
| 12 | 1 | 11 |
| 12 | 2 | 10 |
| 12 | 3 | 9 |
| 12 | 4 | 8 |
| 12 | 5 | 7 |
| 12 | 6 | 6 |
| 12 | 7 | 5 |
| 12 | 8 | 4 |
| 12 | 9 | 3 |
| 12 | 10 | 2 |
| 13 | 1 | 12 |
| 13 | 2 | 11 |
| 13 | 3 | 10 |
| 13 | 4 | 9 |
| 13 | 5 | 8 |
| 13 | 6 | 7 |
| 13 | 7 | 6 |
| 13 | 8 | 5 |
| 13 | 9 | 4 |
| 13 | 10 | 3 |
| 14 | 1 | 13 |
| 14 | 2 | 12 |
| 14 | 3 | 11 |
| 14 | 4 | 10 |
| 14 | 5 | 9 |
| 14 | 6 | 8 |
| 14 | 7 | 7 |
| 14 | 8 | 6 |
| 14 | 9 | 5 |
| 14 | 10 | 4 |
| 15 | 1 | 14 |
| 15 | 2 | 13 |
| 15 | 3 | 12 |
| 15 | 4 | 11 |
| 15 | 5 | 10 |
| 15 | 6 | 9 |
| 15 | 7 | 8 |
| 15 | 8 | 7 |
| 15 | 9 | 6 |
| 15 | 10 | 5 |
| 16 | 1 | 15 |
| 16 | 2 | 14 |
| 16 | 3 | 13 |
| 16 | 4 | 12 |
| 16 | 5 | 11 |
| 16 | 6 | 10 |
| 16 | 7 | 9 |
| 16 | 8 | 8 |
| 16 | 9 | 7 |
| 16 | 10 | 6 |
| 17 | 1 | 16 |
| 17 | 2 | 15 |
| 17 | 3 | 14 |
| 17 | 4 | 13 |
| 17 | 5 | 12 |
| 17 | 6 | 11 |
| 17 | 7 | 10 |
| 17 | 8 | 9 |
| 17 | 9 | 8 |
| 17 | 10 | 7 |
| 18 | 1 | 17 |
| 18 | 2 | 16 |
| 18 | 3 | 15 |
| 18 | 4 | 14 |
| 18 | 5 | 13 |
| 18 | 6 | 12 |
| 18 | 7 | 11 |
| 18 | 8 | 10 |
| 18 | 9 | 9 |
| 18 | 10 | 8 |
| 19 | 1 | 18 |
| 19 | 2 | 17 |
| 19 | 3 | 16 |
| 19 | 4 | 15 |
| 19 | 5 | 14 |
| 19 | 6 | 13 |
| 19 | 7 | 12 |
| 19 | 8 | 11 |
| 19 | 9 | 10 |
| 19 | 10 | 9 |
| 20 | 1 | 19 |
| 20 | 2 | 18 |
| 20 | 3 | 17 |
| 20 | 4 | 16 |
| 20 | 5 | 15 |
| 20 | 6 | 14 |
| 20 | 7 | 13 |
| 20 | 8 | 12 |
| 20 | 9 | 11 |
| 20 | 10 | 10 |
三、小结
20以内的加减法是小学数学的重要基础，通过反复练习和记忆口诀，可以显著提升计算速度和准确性。建议家长或老师根据孩子的学习进度，逐步引导其掌握这些基本运算，并结合实际生活场景进行练习，如购物、分糖果等，增强孩子的兴趣和理解力。
希望这份“20以内的加减法口诀心算表”能对孩子们的学习有所帮助！
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