Negitive 100
558 - 198 - 135 - 73 = 152
98 over 198 simplified = 49/99
If you mean 198 minus 99 then it is 99
198
The greatest common factor of the numbers 5, 98 and 198 is 1.
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.
One sixth of 198 is 33.
98/396 = 49/198.
220 - 22 = 198
98 - 69 = 29
8n + 7 - n - 98 = 7n - 91
7/11 - 6/18 = 126/198 - 66/198 = 60/198 = 10/33