The answer is 1707
354
897 + 902 = 1799
11 256 + 897 --------- 1153
78 + 89 + 167 + 897 + 78 = 1309
456 plus what equals 1242.\
638477283 + 78690377 - 897 = 717166763
456 plus 100 is equal to 556
123 + 456 + 7890 = 8469
-897
4002 + 456 = 4458
898 + 456 = 1354
66 + 456 = 522