It has previously been shown that workers of the ant Myrmica sabuleti can distinguish different numbers of graphic elements sighted as cues even if the shape, color, size, and relative position of these elements differ somewhat. Moreover, these ants were shown to mentally add numbers of identical elements when seeing them simultaneously but not when seeing them consecutively. A further step is needed to examine whether the adding capability of these ants applies only to identical elements or to elements differing by their shape, color, size or location. We first performed an experiment that confirmed that M. sabuleti workers mentally added visual elements identical in their appearance when they perceived them simultaneously. We then experimentally established that these ants did not mentally add up elements seen simultaneously when these elements differ in shape, color or size, but added up similar elements that differ only in spatial location. Such behavior in front of encountered visual cues could help M. sabuleti workers correctly perform tasks such as foraging and navigating between nest and food sites.