Number twenty using tally marks written on a blackboard with chalk

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Size: 3264px × 2448px
Photo credit: © heliography / Stockimo / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: 20, blackboard, chalk, chalkboard, counting, hash, lines, mark, marks, numeral, school, stockimo, system, tallies, tally, tallying, twenty, unary