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.
It is 98*6 = 588
200 + 200 + 200 + 200 + 200 = 1000
34 + 98 + 98 + 87 + 32 = 349
The GCF is 2.
800
200 plus 200 plus 150 plus 150 is equal to 700.
98 plus 65 equals 163.
98 + 14 + 9 = 121
6 + 98 + 6548 = 6,652
96 + 93 + 98 = 287
99 + 98 + 97 = 294