At each step the number being subtracted is reduced by 9
298 - 89 = 209
209 - 80 = 129
129 - 71 = 58
58 - 62 = -4
-4 - 53 = -57..........which is the next number.
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-57. You are taking away 9 less each time.
-57
-57
-57 298 - 89 = 209 209 - 80 = 129 129 - 71 = 58 58 - 62 = -4 -4 - 53 = -57 notice every number is subtracted by 9 less than the previous number's subtrator
-57 (each number that is subtracted from the first is 9 different from the previous (i.e. 298-89=209-80=129-71=58-62=-4-53=-57). As you can see, the amounts that are substracted are 89, 80, 71, 62, 53 (all 9 different from the one before it.)