![](http://www.alamy.com/thumbs/6/50E7A638-C5D3-4710-934E-458F6E55DE2C/FHPW85.jpg)
Math calculations written with chalk on the rusty metal
Size: 3648px × 2736px
Photo credit: © Dmytro Aliokhin / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: aged, arithmetic, art, bad, bent, calculation, chalk, chalkboard, condition, deterioration, dirt, education, equation, exercise, grunge, grungy, hulled, iron, learn, lesson, math, mathematics, metal, numbers, obsolete, outdoor, rough, rusted, rusty, sheet, steel, studies, study, surface, task, texture, weathered, written