Elementary students recite the 'multiplication tables' for foundation of four arithmetical operations. However, memorizing 19 multiplication formula is spreading like a fashion recently in elementary schools. If elementary school students recite the memorizing 19 multiplication formula, the calculation of mathematics questions will be convenient and fast. According to experts, however, memorizing is not only impure as the purpose of the introduction, but also not appropriate in the reality of Korean elementary education. Memorizing 19 multiplication formula can turn elementary students into fool.
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