100 - 7 = 93
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(-7) - 5 - 2 = -14
Inelegant solution. Maximum effort. 100-1-1-1-1-1-1-1= 99-1-1-1-1-1-1= 98-1-1-1-1-1= 97-1-1-1-1= 96-1-1-1= 95-1-1 94-1= 93 ..... ..... ..... ..... ..... ..... ..... ..... Elegant solution. Minimum effort. 100-1-1-1-1-1-1-1= 100-7= 93
18 minus 11 is 7.
-4 + -3 = -7
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.