[?]+[3]=10
Trythiseasycalculation!
Thisappisanumberpuzzlethatmatchesthesumofnumbersfrom2x1to9x9gridto10.
Fromchildrentoadults,youcanhavefunbraintraining.
Ifyousolveitwithgreatskill,yougetabigcarrotasareward.Increaseyourmentalarithmeticandgatheralotofcarrotstoshowoff.
2x1,3x1,4x1,5x1,2x2,3x3:Letthesumofallthenumbersbemultiplesof10.
5x5:Letthesumofthenumbersofhorizontalandverticallinesbemultiplesof10.
6x6,9x9:Letthesumofhorizontal,verticalandsquarenumberstobemultiplesof10.