"One plus one equals two" written in chalk on a green chalkboard

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Size: 4287px × 2848px
Photo credit: © Igor Stevanovic / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: 1, 1+1, 2, add, addition, basic, black, blackboard, calculation, chalk, chalkboard, classroom, clear, education, equals, green, kindergarten, matematics, math, operation, school, simple, true, white, written