Addition and subtraction within 20 | Early Math | Khan Academy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/cc-1... Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/earl... Watch the next lesson: https://www.khanacademy.org/math/earl... Missed the previous lesson? https://www.khanacademy.org/math/earl... Early Math on Khan Academy: Math begins with counting. It's the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, subtract, and measure the world around us. Shortly thereafter, we can learn about place values, plots, graphs, time, money, and shapes. These early math skills are presented in this subject's tutorials in a straightforward, understandable, and (dare we say it) fun way! Want a virtual coach for Early Math? Unlock the Early Math mission on Khan Academy here: https://www.khanacademy.org?utm_sourc... About Khan Academy:

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/cc-1... Learn what the equals sign really means. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/earl... Watch the next lesson: https://www.khanacademy.org/math/earl... Missed the previous lesson? https://www.khanacademy.org/math/earl... Early Math on Khan Academy: Math begins with counting. It's the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, subtract, and measure the world around us. Shortly thereafter, we can learn about place values, plots, graphs, time, money, and shapes. These early math skills are presented in this subject's tutorials in a straightforward, understandable, and (dare we say it) fun way! Want a virtual coach for Early Math? Unlock the Early Math mission on Khan Academy here: https://www.khanacad

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/cc-2... Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/earl... Watch the next lesson: https://www.khanacademy.org/math/earl... Missed the previous lesson? https://www.khanacademy.org/math/earl... Early Math on Khan Academy: Math begins with counting. It's the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, subtract, and measure the world around us. Shortly thereafter, we can learn about place values, plots, graphs, time, money, and shapes. These early math skills are presented in this subject's tutorials in a straightforward, understandable, and (dare we say it) fun way! Want a virtual coach for Early Math? Unlock the Early Math mission on Khan Academy here: https://www.khanacademy.org?utm_sourc... About Khan Academy:

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/cc-2... Learn how to add 7 + 6 using the number line. Early Math on Khan Academy: Math begins with counting. It's the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, subtract, and measure the world around us. Shortly thereafter, we can learn about place values, plots, graphs, time, money, and shapes. These early math skills are presented in this subject's tutorials in a straightforward, understandable, and (dare we say it) fun way! Want a virtual coach for Early Math? Unlock the Early Math mission on Khan Academy here: https://www.khanacademy.org?utm_sourc... About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackl

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/cc-1... Learn how to add 5 + 3 + 6. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/earl... Watch the next lesson: https://www.khanacademy.org/math/earl... Missed the previous lesson? https://www.khanacademy.org/math/earl... Early Math on Khan Academy: Math begins with counting. It's the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, subtract, and measure the world around us. Shortly thereafter, we can learn about place values, plots, graphs, time, money, and shapes. These early math skills are presented in this subject's tutorials in a straightforward, understandable, and (dare we say it) fun way! Want a virtual coach for Early Math? Unlock the Early Math mission on Khan Academy here: https://www.khanacademy.org?utm_s

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/cc-2... Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/earl... Watch the next lesson: https://www.khanacademy.org/math/earl... Missed the previous lesson? https://www.khanacademy.org/math/earl... Early Math on Khan Academy: Math begins with counting. It's the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, subtract, and measure the world around us. Shortly thereafter, we can learn about place values, plots, graphs, time, money, and shapes. These early math skills are presented in this subject's tutorials in a straightforward, understandable, and (dare we say it) fun way! Want a virtual coach for Early Math? Unlock the Early Math mission on Khan Academy here: https://www.khanacademy.org?utm_sourc... About Khan Academy:

学习怎么用凑10的方法做8加7。 自己在可汗学院网站上做练习： Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/earl... 学习下一个视频： https://www.khanacademy.org/math/earl... 错过上一节课： https://www.khanacademy.org/math/earl... 可汗学院的早期数学： 数学从计数开始。这是我们早年学习的最重要的技能，并成为所有其他数学概念的基础。一旦我们能数数，我们就可以加减和测量我们周围的世界。不久之后，我们就可以了解位置值、绘图、图形、时间、金钱和形状。这些早期的数学技能在本课程的教程中以一种简单易懂且（我们敢说）有趣的方式呈现出来！ 想要一个虚拟的早期数学教练吗？到这里来解锁可汗学院的早期数学使命： https://www.khanacademy.org?utm_sourc... 关于可汗学院：可汗学院提供练习，教学视频和个性化的学习进度表，使