It might be possible to work this in your head. Your 98 is 100 minus 2. This means 98 plus 98 is 100 plus 100 minus 2 minus 2. That's 200 minus 4 which gives 196 as the answer.
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98 plus 65 equals 163.
77 + 98 = 175
98 + 52 + 95 + 41 + 100 + 82 + 93 + 84 ÷ 8 = 571.5
5,050
562