If you meant 9/10 - 3/4... First convert both numbers to a common denominator.
9/10 = 36/40 & 3/4 = 30/40 therefore this gives us the answer of 6/40 which equals 3/20 in its simplest form.
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3/10 - 4/5 = 3/10 - 8/10 = -5/10 = -1/2
Odk
3/4
3/4 minus 7/8 = -1/8
5/12