![](http://www.alamy.com/thumbs/6/6ED239A9-1F6D-49CC-94C7-54A2ECE2E826/2T0TCHH.jpg)
Wooden counting rods used to calculate mathematics using colour and shape in early school books, friends of ten
Size: 3941px × 2964px
Photo credit: © Micha Klootwijk / Alamy / Afripics
License: Royalty Free
Model Released: No
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