Writing 1+1=3 on a blackboard.

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Photo credit: © sharpstock / Alamy / Afripics
License: Royalty Free
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Keywords: 1+1=3, addition, blackboard, chalk, concept, education, equals, error, figures, fingers, fun, funny, humor, humorous, humour, humourous, incorrect, math, mathematics, maths, numbers, sign, sum, teach, teaching, white, writing, written, wrong