There are many, in fact an infinite number, of answers. 257+0 256+1 258+(-1) . . . etc
257
257/2 = 128.5 so 128 and 129
257
-27
46% of 257 = 46% * 257 = 0.46 * 257 = 118.22
a straight line,as always, adds up to 180*
A supplementary angle adds up to 90 degrees as a complementary adds up to 180 degrees
40% of 257 = 102.8= 40% * 257= 40%/100% * 257=1028/10= 102.8
257 - 35% = 257 x (1 - (35/100)) = 257 x 0.65 = 167.05
262
how fast can you look up trebuchet
Assuming that "adds up to" means "its digits add up to" 888