penjumlahan dan pengurangan pecahan 2 1/2+1 1/4-1 3/12

2 1/2 + 1 1/4 - 1 3/12
2 2/4 + 1 1/4 - 1 1/4 = 2 2/4 =2,5

2½ + 1¼ - 1 3/12 = 5/2 + 5/4 - 15/12 = 30/12 + 15/12 - 15/12 = 30/12 = 2 6/12 = 2½