If that's -56 + 28, the answer is -28.
If that's -56/28, the answer is -2.
If that's -56 x 28, the answer is -1568.
It's probably not -56 - 28, but if it is, the answer is -84.
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Yes, 28 is a factor of 56, because 56/28 is a whole number.
28 is a factor of 56, and 28 is also a factor of itself. So the highest common factor of 28 and 56 is 28.
28 + 28 = 56
Well half of 56 is 28 because 28 + 28 = 56
28+28=56