A blackboard with the sum 1+1= written on it in white chalk.

---

Images of chalk words on a blackboard.

---

Size: 4200px × 2800px
Location: London, Ontario, Canada.
Photo credit: © Jonny White / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 1+1=, add, answer, blackboard, chalk, easy, equation, maths, simple, word, written