subject: subtraction
goal: End of the class, students should know how to subtract and what the substraction means.
target: ÆĴнº¸¦ ¶¾, 1-20±îÁöÀÇ ¼ýÀÚ¸¦ ÀÎÁöÇÑ preshool ÇнÀÀÚ.
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