4/5-3/8 get common denominator first
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
5/8 - 3/4= 5/8 - 3(2)/4(2)= 5/8 - 6/8= -1/8
3
5/4 in - 3/8 in =((5×2)/(4×2) - 3/8) in = (10/8 - 3/8) in = (10-3)/8 in = 7/8 in
(4/5)*(-3/8) = [4*(-3)]/(5*8) = -12/40 = -3/10