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.25 is the same as   25 / 100   = 1/4

so you have    9  1/4   - 1/2   + 3/8      to add/subtrat fractions , you need to have a common denominator ....8  will work in this case (you could use 12 or 16   etc)

9 1/4   =  37 / 4   =   74/8

1/2 = 4/8

so you have     74/8 - 4/8 + 3/8   =  (74-4+3) / 8 = 73/8 =  9  1/8

so we have that 1/2=0.5 and 3/8=0.375 so when we plug them in we have 9.25-0.5+0.375=9.125=9 1/8 so our final answer is 9.125 or 9 1/8.