2 plus 2 equals 4 simple math problem solved on a school blackboard

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Photo credit: © Paul Catalin Pop / Alamy / Afripics
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Keywords: 2, 4, add, addition, arithmetic, black, blackboard, board, calculate, chalk, chalkboard, classroom, drawing, easy, education, elementary, equals, equation, learn, math, mathematical, mathematics, problem, school, simple, solution, solved, teach