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並前往https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:add-within-20/v/adding-within-20-using-ten-frames

Adding within 20 using ten frames (video) - Khan Academy

the ten frames were the hint or it is just for helping to get the answer? Reply.

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