1/8 + 1/4=1/8+1/8=2/8=1/42/3 - 5/9=6/9-5/9=-1/9 1/2 - 5/12=12/12-5/12=7/12 5/12 - 2/9=15/36-8/36=7/36 1/8 + 7/12=3/24+14/24=17/24