7 and 7/8 - 3 and 2/8 = 4 and 5/8
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Change the fractions so that they have a common denominator. Then subtract the two numerators and put the result over the common denominator. Example: Difference between 1/3 and 1/4. First change the fractions so that they have common denominators: 4/12 and 3/12. Subtract the numerators: 4-3=1 Answer: 1/12.
4
The expected answer is probably difference, whereas it should be "ordered difference". This is because addition is commutative but subtraction is not. That is to say, addition of 3 and 4 gives the answer 7, whether it is calculated as 3 + 4 or as 4 + 3. However, the result of subtraction of 3 and 4 depends on whether you calculate 3 - 4 (= -1) or 4 - 3 (= 1). The difference, in either case is 1 but the ordered difference is the figure in the bracket. .
+4 +3 +3 -4 -3 -2 0 -1 +3 +1+1 0 +1
Not always: Consider 3 and 2: the difference is 3 - 2 = 1 < the larger Now consider 3 and 0: the difference is 3 - 0 = 3 = the larger Now consider 3 and -1: the difference is 3 - (-1) = 4 > the larger.