¤ý¾àºÐ (ÃÖ´ë°ø¾à¼ö¸¦ ±¸ÇÏ¿© ¾àºÐÇϱâ) ¤ýºÐ¼öÀÇ µ¡¼À°ú »¬¼À (ºÐ¸ð°¡ °°Àº ºÐ¼ö) ¤ýReduction of fractions (Reducing fractions by using the greatest common divisor) ¤ýAddition and subtraction of fractions (Fractions with like denominators)