79.7 + 890.43 - 23 = 9.5 e2
its wrong and I am suppose to correct it.
well, looking at the 23, with 3 the least significant digit, your answer cannot be more precise than that, so the answer ends with the ones digit also.
adding them on the calculator..
947.13
so ending with the ones digit, the answer is 947, or if you prefer, 9.47e2