【二十以内加减法口诀表】在小学低年级的数学学习中，加减法是基础中的基础。掌握好20以内的加减法，不仅能帮助孩子提高计算速度，还能为后续的数学学习打下坚实的基础。为了方便记忆和练习，我们整理了一份“二十以内加减法口诀表”，帮助孩子们更快地掌握这一知识点。
一、加法口诀表（1~20）
| 加数A | 加数B | 和（A+B） |
| 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、减法口诀表（1~20）
| 被减数A | 减数B | 差（A-B） |
| 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 |
| 12 | 11 | 1 |
| 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 |
| 13 | 11 | 2 |
| 13 | 12 | 1 |
| 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 |
| 14 | 11 | 3 |
| 14 | 12 | 2 |
| 14 | 13 | 1 |
| 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 |
| 15 | 11 | 4 |
| 15 | 12 | 3 |
| 15 | 13 | 2 |
| 15 | 14 | 1 |
三、小结
二十以内加减法是小学数学的基础内容，通过反复练习和记忆这些口诀，孩子们可以逐步建立起对数字的敏感度和计算能力。建议家长或老师在教学过程中结合实际生活场景进行练习，比如购物、分糖果等，让孩子在轻松愉快的氛围中掌握知识。
此外，还可以使用卡片游戏、口算比赛等方式增强学习的趣味性，帮助孩子更好地理解和记忆加减法口诀。