![](http://www.alamy.com/thumbs/6/0BFC0902-2184-4DE6-A885-6B67131A1691/2T1RFE6.jpg)
Wooden counting rods used to calculate mathematics using colour and shape in early school books, friends of ten
Size: 4392px × 2192px
Photo credit: © Micha Klootwijk / Alamy / Afripics
License: Royalty Free
Model Released: No
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