5/6 - 4/9 + 1/6 - 2/9= 5/6 + 1/6 - 4/9 - 2/9= 6/6 - 6/9= 1 - 2/3= 1/3 5/8 + 1/8 - 3/10 - 1/10= 6/8 - 4/10= 3/4 - 2/5= 0.75 - 0.4= 0.35 9/10 - ( 1/10 + 2/5 )= 0.9 - 0.1 - 0.4= 0.8 - 0.4= 0.4
