#초등4학년1학기나눗셈 #네자리나누기두자리#가장어려운사칙연산#abacus
Synopsis
4-1학기에서 마무리 되는 자연수의 나눗셈을 주산으로 익혀 암산으로까지 척척 나올 수 있게. 자연수의 사칙연산에서 가장 어려워하는 ...
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