定額

Arithmetic symbols drawn with chalk on blackboardの素材 [FY31012649212]

determine abstract add adding addition affair algebra application arithmetic art background banner blackboard blank blankness blocking blunder board business button calculate calculator calculus cerulean chalk chalkboard chrome circle cobalt colorful correct cross cyan decide design dividing division education error failing flat fork glass glassy graphic grunge hook icon judge judgment label lacunae less math mathematical mathematician mistake multiplication multiply negative no number operation passive pattern pick pictogram pitchfork plank plus positive prong proper rectangle removing satined school shadow sign smooth subtraction sum symbol tag texture web write yes