Dion grated 1/2 cup of cheese for a pasta dish. the recipe calls for 2/3 cup. how much more cheese does dion need to grate? which equation could dion have written to correctly solve his problem? circle all that apply.

a. 2/3 = 1/2+1/3
b.2/3 - 1/2 = 4/6 = 3/6
c.2/3 - 1/2 = 8/12 - 6/12
d.2/3 + 1/2= 4/6 + 3/6