4/5 - 3/8 = 32/40 - 15/40 = 17/40
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(3/4) / (5/8) = (3/4) / (8/5) = (3*8)/(4*5) = 24/20 = 6/5
(4/5)*(-3/8) = [4*(-3)]/(5*8) = -12/40 = -3/10
3 over 4 divided by 5 over 8 can be rewritten as 3 over 4 multiplied by 8 over 5. Hence, when we cross-multiply, we have 3 multiplied by 2 over 5 which gives 6 over 5 and equals 1.2.
4 minus 3/8 is 3 5/8
3/4 - 1/8 = 6/8 - 1/8 = (6 - 1) / 8 = 5/8