Adding to 20 - 搜索视频

Adding two-digit numbers without regrouping | Early Math | Khan Academy

Adding two-digit numbers without regrouping | 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-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-100/v/adding-two-digit-numbers-without-regrouping Learn to add 23 + 45 thinking about place value. Practice this lesson yourself on KhanAcademy.org right now ...

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