ㆍ약분 (최대공약수를 구하여 약분하기) ㆍ분수의 덧셈과 뺄셈 (분모가 같은 분수) ㆍReduction of fractions (Reducing fractions by using the greatest common divisor) ㆍAddition and subtraction of fractions (Fractions with like denominators)
