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.
98 - 69 = 29
100% minus 15% is 85% which is 0.85 then 98 x 0.85 = 83.30 so $83.30 Similarly $98 = 100% $9.80 = 10% $4.90 = 5% so 98.00 - 9.80 - 4.90 = 83.30
8n + 7 - n - 98 = 7n - 91
8
53
45 - 15 - 15 = 15
Negitive 100
32 minus 15 is 17.
15 minus 8.75 is 6.25
458 minus 15 is 443.
15 percent of 98.00 = 14.7 15% of 98= 15% * 98= 0.15 * 98= 14.7