7 over 8 = 7/8 = .875
1 and a half = 1.5 = 3/2 = 1.5
.875 - 1.5 = -.625
or (this is the way i do it)
you change 1/2 to 4/8 so it becomes 7/8-4/8. so 7-4 is 3. so the answer is 3/8
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5 over 8
1 minus 1/2 minus 1/3 is equal to 0.166667
1/3 minus 1/2 is -1/6
1 minus a half is a half.
1 over 2