3/10 you cross multiply 5x2=10 so the denominator will be 10 and then cross multiply the numberators by the different denominator make sense? so 5x 1=5 and that mean 1/2=5/10 and 4/5=8/10 and the final answer when u subtract is 3/10 makes sense? u know what i mean jelly bean?
U set up an equation: 80 x 8/5 Then u can cross multiply bc 5 goes into 80 It goes into 80 exactly 16 times So new equation: 16 x 8 Multiply that out and u get 128