![](http://www.alamy.com/thumbs/6/80370C1A-73BC-4343-99D4-D25BE88C0B04/2T0TCHT.jpg)
Wooden cylinder used to calculate mathematics, for children
Size: 3102px × 2008px
Photo credit: © Micha Klootwijk / Alamy / Afripics
License: Royalty Free
Model Released: No
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